ML20086J122
| ML20086J122 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/28/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086J125 | List: |
| References | |
| AO-74-38, NUDOCS 8401230200 | |
| Download: ML20086J122 (2) | |
Text
_
[q.QJ:~'.'.
_ F,;
7 PHILADELPHIA ELECTRIC COMPANY jj O:.
2301 MARKET STREET
,~f 3
Qj L,e>
PHILADELPHI A. PA.19101 j
>7g
\\ i,g 1215)841 40o0
%s-[
3,D December 28, I974
- Y Mr. A. Giambusso Deputy Director of Reactor Projects I
United States Atomic Energy Commission Directorate of Licensing Washington, DC 20545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, A.E.C. Region 1 Regulatory Operations Office on December 19, 1974.
Written notification was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on December 19, 1974.
In accordance with Section 6.7.2.A of the Technical Specifications, 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 Technical Specification Reference 3 5.G Report No.:
50-278-74-38 Report Date:
December 28. 1974 I
Occurrence Date:
December 18, 1974 Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:
Manual isolation valve from the "B" Core Spray Discharge Header to the " Stay Full system accumulator was found ' closed; this valve should be open.
Conditions Prior to Occurrence:
~
i Unit 3 at approximately 73X power.-
I Description of Occurrence:
~
1 While conducting ST 1.5 the "B" Core ' Spray' Logic System Func-tional Surveillance Test, it was not possible to pressurize between MOV-3-14-118 and MOV-3-14-128 to stroke the later valvo.
Inve stig at ion determined that the stay full system. vent solenoid, SV-5224, which opens -
on-low level,.was open. Further investigation found that the " Stay Full"
. IO hvpnp' {
?
j: A} h. d5 :-
/ z;:
,.8401230200 741228-
- )
PDR ADOCK 05000278 8
PDR ~
C(FY SENf glONf h
Mr. A. Giambusso Occcmber 28, 1974 Page 2 accumulator was valved out of service. The " Core Spray Line Vent Accumulator Low Level" alarm was also found to be inoperabic.
Designation of Apparent Cause of Orcurrence:
The last checkoff list shows that the val ve was open, and the last calibration on this accumuis ter was prior to the checkof f list.
The reason for the valve being closed was investigated, but was not determined.
Analysis of Occurrence:
The fact that this valve was closed has very littic safety implication because the system is pressurized continuously by the con-densate transfer system. When the system was returned to service it was judged that the piping system was full except for the accumulator.
Corrective Action:
The Unit 3 Core Spray System Valve Check-Of f List was redone; no other valves were found to be "off-normal".
The " Stay Full" system valving on both Unit 2 and Unit 3 RHR and Core Spray systems were veri-ficd to be alioned properly.
The icvel annunciator microswitch which failed to alarm the low level was repaired.
Failure Data:
Nonc previous on the " Stay Full" system.
Very truly yours,
/
M. J. Cooney Ass' t Gen ' l Super intendent Generation Division 1
l cc:
Mr. J. P. O'Reilly l
Director, Reqion 1 U. S. Atomic Energy Commissio'n 631 Park Avenue King of Prussia, PA 19406
?