BQ KHOA HOC VA CONG NGHE CQNG HOA XA H0I CHU NGHIA VlfT NAM Doc lap - Tu* do - Hanh phiic S6: 12/2015/TT-BKHCN Ha Mi, ngay 20 thdng 7 nam 2015 THONG TIT Quy dinh ve phan tich an toan doi \m nha may dien hat nhan Can cu Luat ndng luang nguyen tu ngay 03 thdng 6 nam 2008; Can citnghi dinh so 70/2010/ND-CP ngay 22 thdng 6 nam 2010 cua Chinh phu quy dinh chi tiet va huong dan mot so Dieu cua Luat ndng luong nguyen tie ve nha may dien hat nhan; Can cu Nghi dinh so 20/2013/ND-CP ngay 26 thdng 02 nam 2013 cua Chinh phu quy dinh chuc ndng, nhiem vu, quyen han va ca cdu to chuc cua Bp Khoa hoc va Cong nghe; Theo de nghi cua Cue tuang Cue An toan bite xa va hat nhan va Vu tuang Vu Phdp chi, Bo tuang Bo Khoa hoc va Cong nghe ban hanh Thong tu quy dinh ve phdn tich an toan doi voi nha may dien hat nhan. Dieu 1. Pham vi dieu chinh Chicng I QUY DINH CHUNG Thong tu nay quy dinh yeu cau ve phan tich an toan bao gom phan tich an toan tat dinh va phan tich an toan xac suat doi voi nha may dien hat nhan (sau day duoc vi6t tat la NMDHN). Cac yeu cau ve phan tich an toan tai Thong tu nay duoc hieu la phu hop voi muc do chi tiet cua thiet ke tuong ung cac giai doan phe duyet du an dau tu, cap phep xay dung, cap phep van hanh va tong qua tinh van hanh NMDHN. Dieu 2. Doi tuong ap dung Thong tu nay ap dung doi voi to chuc, ca nhan co lien quan toi viec lap, tham dinh bao cao phan tich an toan cho NMDHN. Dieu 3. Giai thich ti ngu' Tong Thong tu nay, cac tu ngu dudi day duoc hieu nhu sau: 1. Phdn tich an toan tat dinh la phuong phap phan tich nham tien luong cac hien tuong xay a sau su kien khoi phat gia dinh thong qua viec ap dung day du cac quy luat va tieu chi chap nhan cu the. Phan tich an toan tat dinh bao gom cac
phan tich naton, thiiy nhiet, bic xa, co nhiet va cau tue bang cac cong cu tinh toan. 2. Phdn tich an toan xdc sudt la phuong phap phan tich mang tinh he thong nham xac dinh sai hong, ui o voi xac suat xay a duoc dinh luong bang cac cong cu tinh toan. 3. Phdn tich do nhay la phan tich nham danh gia muc do thay doi cua cac ket qua dau a khi dieu chinh cac thong so dau vao, thuong la cua cac thong so co anh huong Ion nhat. 4. Phdn tich do bat dinh la phan tich nham danh gia sai so cua cac dai luong dau vao va cua ket qua tinh toan. 5. Tiep can bao thu la viec su dung chuong tinh tinh toan, mo hinh, du lieu dau vao va gia djnh nham danh gia mot each than tong nhat ve an toan. 6. Do du tu an toan la muc du phong giua ket qua phan tich, danh gia cac tham so lien quan toi an toan va cac giai han an toan theo quy dinh cua co quan co tham quyen. 7. Kiem chimg la qua tinh xac dinh tinh dung dan cua phuong phap, chuong tinh hoac mo hinh tinh toan theo mo ta, du dinh hay yeu cau dat a. 8. Xdc thuc la qua tinh xac dinh tinh phu hop voi thuc nghiem cua phuong phap, chuong tinh hoac mo hinh tinh toan theo cac chuc nang da djnh. 9. Su kien khai phat gia dinh la su kien gia dinh phat sinh tue tiep tu hu hong cau tue, he thong, bo phan hoac loi van hanh va hu hong phat sinh tue tiep do cac nguy hai ben tong va ben ngoai khi NMDHN van hanh 6 cong suat danh dinh, cong suat thap hoac d tang thai dung 16 phan ung. 10. Ty so ai khoi soi bot (DNBR) la ti so cua thong luong nhiet toi han ten thong luong nhiet cue bo thuc te cua thanh nhien lieu. Chuong II YEU CAU CHUNG DOI VOI CAC PHlTONG PHAP PHAN TICH AN TOAN NHA MAY DIEN HAT NHAN Dieu 4. Pham vi ap dung phan tich an toan 1. Phan tich an toan NMDHN phai duoc tien hanh theo ca hai phuong phap phan tich an toan tat dinh va phan tich an toan xac suat, nham danh gia muc do an toan nha may ung voi cac tang thai va che do van hanh khac nhau. 2. Phan tich an toan NMDHN phai duoc thuc hien 6 tat ca cac tang thai, bao gom van hanh binh thuong, tang thai bat thuong, su co tong co so thiet ke, su co ngoai co so thiet ke va su co nghiem tong. 2
3. Phan tich an toan NMDHN phai xac dinh tan suit xay a su kien khoi phat gia dinh, thong so vat ly va thuy nhiet cua cac he thong quan tong ve an toan, tinh tang cua cac lop ao chan vat ly va hau qua o i phong xa a moi tuong. 4. Phan tich an toan phai bao gom cac su kien phat sinh tu cac nguy co ben tong, nguy co ben ngoai va qua tinh co the gay hu hong cac lop giam giu chat phong xa hoac lam tang ui o o i phong xa a moi tuong. Cac nguy co ben ngoai co tan suat xay a thap nhung co the dan toi nong chay vung hoat phai duoc tinh den tong phan tich su co nghiem tong. 5. Lia chon phan tich si kien va cac dien bien tiep theo phai dua ten co so phuong phap tiep can co tinh he thdng va logic. Phai cung cap day dii luan chung cho viec xac dinh tat ca cac kich ban si co lien quan toi an toan. 6. Yeu cau cu the doi voi pham vi thuc hien phan tich an toan xac suat, bao gom: > \ / a) Thuc hien phan tich an toan xac suat muc 1 nham xac dinh tan suat xay a cac si kien co the dan toi nong chay vung hoat; uoc luong tan suat nong chay vung hoat; danh gia diem manh, diem yeu cua cac he thong an toan va quy tinh van hanh nham ngan ngua nong chay vung hoat; b) Thuc hien phan tich an toan xac suat muc 2 nham xac dinh con duong co kha nang phat thai chat phong xa tong si co nghiem tong, uoc tinh muc do va tan suat xay a phat thai; danh gia muc do day du cua cac bien phap ngan ngua va giam thieu phat tan phong xa a ngoai moi tuong; c) Thuc hien phan tich cho 16 phan ung, be chua nhien lieu tai tat ca cac che do van hanh va tang thai NMDHN; d) Phan tich si kien khoi phat bao gom si kien ben tong nha may, loi do con nguoi, cac nguy co ben tong va ben ngoai. 7. Pham vi, muc do chi tiet cua phan tich an toan phai tuong ung voi muc do hau qua buc xa va tan suat xay a si kien. Dieu 5. Phan tich an toan tong thiet ke NMDHN 1. Xac dinh co so thiet ke cho cac hang muc quan tong ve an toan; vai to cua chung tong viec giam thieu cac si kien khoi phat gia dinh cung nhu tong chuoi si kien. 2. Phan tich an toan phai chung minh duoc thiet ke da dap ung du muc do bao ve theo chieu sau. 3. Phan tich an toan phai luan chung duoc viec ap dung cac gia dinh, phuong phap, do bat dinh va muc do bao thu tong thiet ke. 3
4. Ap dung chuong tinh bao dam chat luong phu hop tong thuc hien phan tich an toan. Dieu 6. Ket qua cua phan tich an toan tat dinh va an toan xac suat 1. Ket qua cua phan tich an toan tat dinh bao gom viec so sanh cac ket qua phan tich voi tieu chi chap nhan duoc quy djnh tai Chuong III cua Thong tu nay va cac noi dung sau day: a) Khang djnh si phu hop cua co so thiet ke cho tat ca cac hang muc quan tong ve an toan; si phu hop cua giai han, dieu kien van hanh va cac hanh dong can thiet cua nhan vieh van hanh; b) Khang dinh cac si kien khoi phat gia djnh la phu hop voi dac diem cua dia diem va thiet ke NMDHN; c) Luan chung viec quan ly cac tang thai bat thuong va su co tong co so thiet ke nha kich hoat he thong an toan la phu hop voi cac tieu chi chap nhan; d) Luan chung viec quan ly cac si co ngoai thiet ke nho su dung cac tinh nang an toan ma khong bi anh huong boi chuoi si co la phu hop voi tieu chi chap nhan. 2. Ket qua cua phan tich an toan xac suat bao gom viec so sanh ket qua phan tich voi cac tieu chi chap nhan duoc quy dinh tai Chuong III ciia Thong tu nay va cac noi dung sau day: a) Luan chung khong co si kien khoi phat gia djnh dong gop qua Ion toi tong the ui o hoac dong gop dang ke toi do bat dinh cua ket qua phan tich; b) Luan chung viec cac lop bao ve theo chieu sau phai doc lap toi da a muc co the dat duoc tong thuc te; c) Luan chung viec ngan ngua hieu ung thang giang dot ngot anh huong den an toan do bien dong cua thong so dau vao. Dieu 7. Yeu cau ieng doi voi phan tich an toan tat djnh 1. Khi thuc hien phan tich an toan tat dinh phai bao dam du do du tu an toan giua gia ti tinh toan cua cac thong so quan tong va gia ti ngucng dan toi phat thai phong xa ngay ca tong tuang hop su dung phuong phap uoc luong tot nhat. 2. Phan tich an toan tat dinh cho muc dich thiet ke phai bao dam tinh bao thu tong do co tinh toi do bat dinh cua mo hinh mot each hop ly, tu tuong hop phan tich si co ngoai co so thiet ke. 3. Viec lia chon du lieu tinh toan va cac gia dinh phai tinh toi do bat dinh cua cac yeu to sau: a) Dieu kien van hanh ban dau cua nha may; 4
b) Kha nang van hanh ciia cac he thong an toan; c) Thao tac ciia nhan vien van hanh; d) Si sin sang cua dien luoi de co the khoi dong cac he thong an toan. 4. Khi phan tich moi si kien, phai thuc hien cac quy djnh sau: a) Xac dinh cac tieu chi chap nhan lien quan va cac thong so vat ly giai han; b) Lia chpn dieu kien ban dau va dieu kien bien theo huong bao thu tuong ung cho tung tieu chi chap nhan. Phai thuc hien phan tich do nhay de luan chung viec lia chon nay khi can thiet; c) D6i voi cac he thong va thiet bi cua nha may khong duoc thiet ke de van hanh o cac tang thai nhat dinh thi phai gia dinh la chung bi hong hoac chung duoc van hanh theo each lam cho su kien khoi phat tam tong hon, tu khi co thi chung minh kha nang van hanh cua chung dat do tin cay cao; d) Khi phan tich si co tong co so thiet ke, phai gia djnh xay a sai hong don nghiem tong nhat tong van hanh he thong an toan. Dieu 8. Phan tich do bat djnh va phan tich do nhay 1. Ket qua phan tich an toan phai bao gom ket qua phan tich do bat djnh va ket qua phan tich do nhay. 2. Do bat dinh phai duoc dinh luong va luan giai o phuong phap xu ly, co tinh den nguon goc, ban chat cua cac yeu to bat dinh. Dieu 9. Chuong tinh tinh toan tong phan tich an toan 1. Uu tien su dung chuong tinh tinh toan uoc luong tot nhat voi kha nang mo phong thuc nhat cac hien tuong quan tong va hoat dong cua cac he thong tong nha may. 2. Phuong phap tinh toan, chuong tinh tinh toan va mo hinh tinh toan tong phan tich an toan phai duoc kiem chung va xac thuc. Dieu 10. Su dung kinh nghiem van hanh tong phan tich an toan 1. Thu thap va danh gia du lieu ve hoat dong van hanh co kha nang su dung cho phan tich an toan, bao gom ca viec xem xet tang thai bat thuong va si co da xay a tong qua tinh van hanh tai cac NMDHN tuong tu. 2. Du lieu ve kinh nghiem van hanh bao gom: a) Ho so cac tang thai bat thuong va si co xay a tong qua tinh van hanh; b) Loi do nhan vien van hanh; c) Hoat dong cua he thong an toan; 5
d) Do tin cay cua cac hang muc quan tong ve an toan; d) Lieu buc xa; e) Viec sinh a chat thai phong xa. 3. Tong suot thai gian hoat dong cua NMDHN, phai thu thap du lieu ten co so cac chi so chat luong an toan cua nha may. Phai su dung du lieu ve kinh nghiem van hanh mot each phu hop, cung voi viec su dung cac tien bo khoa hoc, ky thuat tong phuong phap phan tich an toan va cac ket qua nghien cuu lien quan nham cap nhat ket qua phan tich an toan va danh gia he thong quan ly. Chuong III TIEU CHI CHAP NHAN DOI VGT PHAN TICH AN TOAN A A A A A ' A A Dieu 11. Yeu cau ve viec thiet lap tieu chi chap nhan 1. Tieu chi chap nhan phai duoc thiet lap cho toan bo cac tang thai van hanh va dieu kien su co. Cac tieu chi nay phai bao dam duy ti du muc do bao ve theo chieu sau, bao dam khong gay a muc nguy hai khong chap nhan duoc doi voi con nguoi, moi tuong. 2. Tieu chi chap nhan duoc thiet lap dua ten cac yeu to sau day: a) Dac diem su kien khoi phat gia dinh, dac biet la tan suat xay a; b) Loai cong nghe 16 phan ung; c) Cac dieu kien thuc te cua nha may, dac biet la kha nang tu cap dien; d) Pham vi va cac dieu kien ap dung cua moi tieu chi. Ap dung tieu chi nghiem ngat hon doi voi su kien co tan suat xay a Ion hon. 3. Tieu chi chap nhan cho moi tang thai van hanh hoac dieu kien su co bao gom: a) Tieu chi chung lien quan toi hau qua phat tan phong xa; b) Tieu chi cu the lien quan toi tinh toan ven cua cac lop bao ve chong phat tan phong xa bao gom vien nhien lieu, vo thanh nhien lieu, bien chiu ap chat lam mat 16 phan ung va boong-ke 16. A A A A A A A A A Dieu 12. Tieu chi chap nhan doi voi phan tich an toan tat djnh ve hau qua ciia phat tan phong xa 1. Lieu buc xa doi voi nhan vien nha may va dan chung tai cac tang thai van hanh tong suot vong doi nha may phai tuan thu nguyen ly ALARA. Giai han lieu doi voi mot nguoi dan phai nho hon 1 msv/nam. 2. Tat ca cac su co tong co so thiet ke khong duoc gay a tac dong dang ke ve phong xa tai dia diem hoac ngoai dia diem va khong can den bat ky bien phap ung pho nao ngoai dja diem. Gioi han lieu doi voi nguoi dan do su co tong co 6
so thilt ke (khong tinh toi viec hap thu chat phong xa qua duong an uong) phai nho hon 5 msv/nam. 3. Su co ngoai co so thiet: ke co the din toi phat tan luong Ion phong xa a, / moi tuong phai duoc loai tu tong thuc te. Voi cac su co ngoai co so thiet ke khac, phai co cac bien phap han che phat tan sau khoang thai gian va tong pham vi nhat dinh dl co du thoi gian tien khai cac bien phap bao ve dan chung. 4. Viec phat tan chat phong xa tu su c6 nghiem tong khong duoc phep gay a cac hau qua sau: a) Gay t6n thuong buc xa cap tinh toi sue khoe cua dan chung tong khu vuc lan can NMDHN; b) Han che viec su dung dat va nuac tong thoi gian dai ten dien ong; c) Phat tan Cs-137 a ngoai moi tuong vuot qua 30 TBq; d) Sau ba thang kl tu thoi diem xay a su co, to hop cac dong vi phong xa khac dong vi cua Cesi lang dong gay a nguy hai Ion hon nguy hai do phat tan Cesi voi gioi han duoc de cap tai diem c khoan nay. Dieu 13. Tieu chi chap nhan chung doi voi phan tich an toan tat dinh 1. Cac dac tinh cua thiet ke, kha nang kich hoat tu dong cua he thong an toan ket hop voi hanh dong can thiet cua nhan vien van hanh phai du hieu qua de bao dam: a) Khong lam nghiem tong hon tang thai cua nha may; b) Khong lam phat sinh them sai hong don; c) Khong lam mat kha nang van hanh ciia he thong an toan hoac tinh nang an toan can thiet de giam thieu hau qua cua su co. 2. He thong duoc su dung de giam thieu hau qua su kien phai co kha nang \ chiu tai cue dai, ung suat va dieu kien moi tuong tuong ung voi su kien duoc phan tich. 3. Ap suat tong cac he thong o vong so cap va thu cap phai khong vuot qua gioi han thiet ke doi voi tung tang thai nhat dinh cua nha may. 4. Su kien khoi phat gia dinh co the dan den hu hai lop vo cua mot so thanh nhien lieu nhing van dap ung duoc tieu chi chap nhan ve hau qua cua phat tan phong xa quy dinh tai Dieu 12 cua Thong tu nay. 5. Voi tat ca cac su co tong co so thiet ke, phai duy ti dang hinh hoc cua vung hoat, dap ung kha nang lam mat vung hoat. 6. Su co tong co so thiet ke khong duoc phep gay a nhiet do, ap suat, chenh lech ap suat hoac cac tai khac tac dong toi boong-ke 16 vuot qua gia ti duoc su dung lam co so thiet ke. 7
Dieu 14. Tieu chi chap nhan cu the doi voi phan tich an toan tat dinh 1. Xac djnh cac tieu chi chap nhan cu the de bao dam du do du tu an toan, bao dam tinh toan ven cua cac lop ngan chan phat tan phong xa. Xem xet ap dung cac tieu chi chap nhan cu the sau: a) Tieu chi lien quan toi tinh toan ven cua cau tue vien nhien lieu bao gom: nhiet do cue dai tong vien nhien lieu, gia ti cue dai cua enthalpi nhien lieu tung binh theo ban kinh (cung voi su phu thuoc cua chung vao do sau chay va thanh phan nhien lieu); b) Tieu chi lien quan toi tinh toan ven cua lop vo thanh nhien lieu bao gom: gia ti cue tieu cua ti so oi khoi soi bot (DNBR) (doi voi 16 nuoc ap luc) hoac ti so cong suat toi han (CPR) (doi voi 16 nuoc soi), gia ti cue dai ciia nhiet do lop vo thanh nhien lieu, gia ti cue dai muc 6-xi hoa cue bo lop vo thanh nhien lieu; c) Tieu chi lien quan toi tinh toan ven cua vung hoat 16 phan ung bao gom: muc do duai toi han, luong hydo cue dai sinh a do 6-xi hoa lop vo thanh nhien lieu, so luong cue dai cac thanh nhien lieu va bo nhien lieu bi hu hong; d) Tieu chi chap nhan lien quan toi tinh toan ven cua he thong lam mat (vong so cap) 16 phan ung bao gom: nhiet dp va ap suat cue dai cua chat lam mat; thay doi nhiet do, ap suat va ung suat gay a tai bien chiu ap chat lam mat 16 phan ung; khong xay a nut, gay gion hoac deo do khuyet tat gia djnh tong thung 16 phan ung; d) Tieu chi chap nhan lien quan toi tinh toan ven cua vong thu cap bao gom: nhiet do va ap suat cue dai, thay doi ap suat va nhiet do cua chat cong tac tong cac thiet bi thuoc vong thu cap; e) Tieu chi chap nhan lien quan toi tinh toan ven cua boong-ke 16 va gioi han su phat tan chat phong xa a moi tuong bao gom: ap suat va nhiet do cue dai va cue tieu ben tong boong-ke 16, chenh lech ap suat cue dai giua hai lop boong-ke 16 (tuong hop thiet ke boong-ke hai lop vach), muc do o i, nong do khi de chay, no, thong so ve dieu kien moi tuong chap nhan duoc doi voi hoat dong cua cac he thong. 2. Doi voi su kien khoi phat gia dinh xay a tong khi dung 16 hoac tuong hop dan toi viec suy giam tinh nguyen ven ciia cac lop bao ve, phai ap dung tieu chi chap nhan nghiem ngat hon nham khong de xay a phoi tan bo nhien lieu. Dieu 15. Tieu chi chap nhan d6i voi phan tich an toan xac suat 1. Doi voi phan tich an toan xac suat muc 1, tong tan suat gay nong chay vung hoat phai nho hon 10" 5 /16.nam. 2. Doi voi phan tich an toan xac suat muc 2, tong tan suat gay phat tan luong phong xa Cs-137 Ion hon 30 TBq a moi tuang phai nho hon 10" 6 /16.nam. 8
Dieu 16. Dieu khoan chuyen tiep ChuongIV DIEU KHOAN THI HANH Tuang hap to chuc, ca nhan nop bao cao phan tich an toan toi Bo Khoa hoc va Cong nghe tuoc ngay Thong tu nay co hieu lie khong phai thuc hien theo quy dinh tai Thong tu nay. Dieu 17. Hieu luc thi hanh 1. Thong tu nay co hieu luc thi hanh ke tu ngay 05 thang 9 nam 2015. 2. Tong qua tinh thuc hien, neu co vuong mac hoac co van de moi phat sinh, de nghi co quan, to chuc, ca nhan kip thai phan anh ve Bo Khoa hoc va Cong nghe de xem xet sua doi, bo sung./. Nai nhan: - Thu tuong Chinh phu (de b/c); - Cac Pho Thu tuong Chinh phu (de b/c); - Cac Bp TNMT, Cong Thuong, Xay dung va Vi$n Han lam Khoa hoc va Cong nghe Viet Nam; - UBND tinh Ninh Thuan; - Tap doan Dien luc Vift Nam; - Cue Kiem ta van ban (Bo Tu phap); - Cong thong tin dien tu Chinh phu; Cong bao; - Liu: VT, PC (5b), ATBXHN (5b). KT. BO TRUCfNG 9