ML20086J257
| ML20086J257 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 11/22/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-74-22, NUDOCS 8401230527 | |
| Download: ML20086J257 (2) | |
Text
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s PHILADELPHI A ELECTRIC COM PANY s
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2301 MARKET STREET PHILACELPHIA, PA.19101 (215) 8414ooo November 22, 1974 Mr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing Washington, D.C.
20545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The folicwing occurrence was reported to Mr. Walt Baunack, A.E.C. Region 1 Regulatory Operations Office on, November 13, 1974.
Written noti fication was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on November 13, 1974.
In accordance with Section 6.7.2.A of the Technical Speci fications, Appendix A of DPR-56 for Unit 3 Peach Bottom Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence:
Reference:
License Number DPR-56 Techni cal Speci fication Reference 3.7.D Report No.:
50-270-74-22 Report Date:
November 22, 1974 Occurrence Date:
November 12, 1974 -
Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identi fica ti on of Occurrence:
Main Steam Line Sample Valves-Inboard A0-316 does not indicate closed when called on to close.
Outboard A0-317 strokes properly but leaks through.
Condi tions Prior to Occurrence:
I l.'
Plant at normal opera ting conditions, approxima tely 73% power.
8401230527 741122 0500027 gDRADDCK b
COPY SENT LEGION X b i
November 22,-197 Page 2
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Descriotion of Occurrence:
During reutine surveillance of the PCIS logic system, A0-316 failed to indicate closed en an isolation signal. While attempting to verify valve closure by sample flow indication, it was discovered that the sarple flow did not cease when either A0-316 or A0-317 was closed.
Therefore, neither air operated valve produced isolation of the line.
Designation of Acoarent Cause of Occurrence:
Investigation showed that the solenoid valve for A0-316 operated properly but the position indication did not change when this. valve was called on to close. Since A0-316 is located-inside the drywell, no further investigation was possible. The outboard valve, A0-317 is accessible and was tested for proper stroke and seating - both checked satisfactorily, but the valve still failed to stop sample flow.
Analysis of Occurrence:
1 A0-316 could not be verified in the isolation condition, so the outboard valve, A0-317 was placed in.the isolation condition. However, testing showed that sample flow did not stop. Therefore, the manual block valve at the sample rack was blocked closed and padlocked to isolate this sample line.
Corrective Action:
Corrective raintenance will be performed on both valves when plant conditions permit. During further investigation of A0-317 some ninor adjusteents were performed on the valve. operator which allowed proper closure and seating of the valve. - Testing performed proved the valves
- capability to stop flow.
Flow through the sample line was established, and A0-317 was closed, flow ceased. Normal. plant blocking f
procedures were applied to the outboard valve, A0-317, to ensure that j
i t remain in the isolation condi tion.
As required by Technical Specifications, a ' daily log of the i
position of the outboard isolation valve and the manual isolation valve was imediately instituted.
{
Failure Data:
(
[
None.
a Very truly yours,
)')'llf(;4,U9/
M. J. Cooney /.
. AsI8 t Gen' t Superintendant Generation Division
- cc: Mr. J.s-P. O'Rei lly Director, Region I United States Atomic Energy Commission 631. Park Avenbe.
King of Prussia,-PA, 19406:
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