ML20084E199
| ML20084E199 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 06/14/1974 |
| From: | Platt C ROCHESTER GAS & ELECTRIC CORP. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20084E197 | List: |
| References | |
| AO-50-244-74-10, NUDOCS 8304140425 | |
| Download: ML20084E199 (2) | |
Text
{{#Wiki_filter:* qns ls n'"7 w,s jg y d L.) w., w .a, ROCHESTER CAS AND ELECTRIC CORPORATION e 89 EAST AVENUE, ROCHESTER, N.Y.14649 T R L E pwcas t 'd' % m'j j ' ..c. coor,. 540 27oo [,/ y,, .,N'y(g Ginna Station p-June 14, 1974 Y O g (L. o m;y r [.- ~ u aE JUN191974 e-- 3d n.s.new v n p./ y cc: : :. x p/ Lan N 3*" Mr. James P. O'Reilly, Director ,p,/ 4 Directorate of Regulatory Operations f Region 1 U.S. Atomic Energy Commission 631 Park Avenue King of Prussia, Pennsylvania 19406
Subject:
Abnore11 Cccurrence 74-10: An unplanned release of radioactive material from the site boundary Ginna Station - Docket !i50-244
Dear Mr. O'Reilly:
This is to confirm my conycrsation with Mr. Lcc Speccard today to report Abnormal Occurrence 74-10 at Ginna Station. During the afternoon of June 13, 1974, maintenance work was performed on the Sampic System Flow Indicator FI-903. The maintenance work was com-plcted and the Sample System was restored to service at 1535 on June 13, 1974. Inadvertently, a valve between the Sampling System and the Chemical Drain Tank which is normally closed was opened whil'c restoring the Sampling System to service. This allowed primary coolant water that was going through a fuel element failure deticctor to go to the chemical drain tank instead of the volume control tank. At 1715 there was an automatic makeup to the primary system and the computer indicated a 1.28 gpm leakage rate. An investigation was started inmediately. At 1717, a computer alarn from the Auxiliary Building gas monitor sounded. The investigation uncovered the fact that Valve 991 was open and the chcmical drain tank was full and overflowing. The valve was closed inmediately and the chemical drain tank was pumped down to a normal level. The last computer alarm from the gas monitor was at 174l. Prior to the incident, the release rate from the Auxiliary Building Ventila-tion System was approximately.2 Ci of Noble gases per hour. During the two hours of the incident,.9 Ci of Noble gases were released to the atmosphere. This amounted to.37. of the Technical Specification limit. k V h> C W,^1O 8304140425 740621 W PDR ADOCK 05000244 ' COPY SENT REGION / )
m - 1 f I U[h g,,3 T. \\ / Abnormal Occurrence 74-10 June 14, 1974 All plant operating conditions had returned to normal by 1900. Very truly yours, ga,,E.Pate Charles E. Platt Superintendent CEP:fah cc: Mr. J. F. O' Leary, AEC Mr. G. J. Swarthout, RC6E Mr. L. D. White, Jr.,RG&E e 4 e 9
N3YM 51kha x..,_._. ~ RbCNESTER GAS AND ELDRIC CORPORETl0N o 09 EAST AVEQ C0CNESTER, N.Y 5 09 h-- D Massmas Mc. gana.c.n m saa s oo j, C y ?[ [? Ginna Station ?{*fp}n; June 14, 1974 / ,k.hG$ ~ ,. t s.. }m:-{%? /, - [W.(, Mr. James P. O'Reilly, Director ',? J -w.i Directorate of Regulatory Operations -[@' ~ Region 1 l U.S. Atcaic Energy Coussission . m J. '" g g". 631 Park Avenue King of Prussia, Pennsylvania 19406
==eNassa subject: Abnormal Occurrence 74-10t An unplanned release of radioactive m n =ea material from the site boundary j;gf,, Cinna Station - Docket #50-244 gg.-. .3...
- qd; $
.[ Dear Mr. O'Reilly This is to confirm my conversation with Mr. Lee Spessard today to report h.-y.f Abnormal Occurrence 74-10 at Cinna Station. 7 5% g During the afternoon of June 13,,1974, maintenance work was performed on -;.j-Q.J ? p <.= the Sample System Flow Indicator FI-903. Me maintenance work was com-i pleted and the Sample System was restored co service at 1535 on Juns 13, 'T4T 1974. Inadvertently, a valve betw en the Sampling System and the Chemical ..gggj Drain Tank which is normally closed was opened while restoring the Sampling 7g g; System to servir.e. This allowed primary coolant water that was going through . : -4 ,7 '7' 42 a fuel element failure detector to go to the chemical drain tank instead of .f? the volume control tank. 5 dk it 1715 there was an automatic cakeup to the primary system and the computer "88 indicated a 1.28 gpm leakage rate. An investigation was started immediately. NN At 1717, a computer alarm from the Auxiliary Building gas monitor sounded. The investigation uncovered the fact that Valve 991 was open and the chemical g-yg. drain tank was full and overflowing. The valve was closed inmediately and ggg.; the chemical drain tank was pumped down to a no:nal level. The last computer g.94 fj alarm from the gas monitor was at 1741. Prior to the incident, the release rate from the Auxiliary Building Ventila- [.h; h tion System was approximately.2 Ci of Noble gases pe.r hour. During the two ~if. jg hours of the incident,.9 Ci of Noble gases were released to the atmosphere. .H., J This amounted to.37,of the Technical Specification limit. g, f s. i,, p \\; /p, \\{.........,.. -. ?p.ll l: ~ ,p' .. L\\ m.: t
3...:.1 _ g.. z a a.. h ;.. 3 _sa c a.x.... a u. 2,,; 2 ;,a r..:. o o All' picat operating conditions had returned to normal by 1900. - "-- %~:.. 'Very truly yours, c h e.e x - . Charles E. Platt '~ Superintendent. CEP:fah cc: Mr. J. F. O' Leary, AEC Mr. C. J. Svarthout, RC&E Mr.. L. D. White, Jr.,RC&E t t S 9 b ee e . Oet 6 O e 1 1 e}}