ML20086K290
| ML20086K290 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 12/02/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086K294 | List: |
| References | |
| AO-74-28, AO-74-53, NUDOCS 8401260447 | |
| Download: ML20086K290 (2) | |
Text
-
O
- PHILADELPHIA ELECTRIC ~ COM PANY
, '(. = ~
- N 2301 MARKET STREET PHILADELPHI A. PA.19101 tr -
(215) 841-4ooo 9
December 2, 1974
'/'y,
_gq\\.
,1
~-
Mr. A. Giambusso Deputy Director of Reactor Projects United States Atomic. Energy Comnission Directorate of Licensing Washington, DC 20545
Dear Mr. Giambusso:
Subject:
Abnornal Occurrence The following occurrence was reported to Mr. Walt Baunack, A.E.C. Region 1 Regulatory Operations Office on November 22, 1974.
Written notification was made to Mr. James P. O'Reilly, Region i Regu-latory Operations Office on November 22, 1974.
In accordance wi th Section 6.7 2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 and DPR-56 for Unit 3 Peach Botto.T Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence.
Reference:
License Number OPR-44 and DPR-56 Technical Specification Reference 3 5.B Report No.:
50-277-74-53 and 50-278-74-28 Report Date:
December 2, 1974 Occurrence Date: November 22, 1974 Faci li ty:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:
Failure of attaching bolts between limitorque operators and valve yokes on HPSW/RHR heat exchanger discharge valves M0-2-10-98A and M0-3-10-898.
Conditions Prior to Occurrence:
Units operable at various power icvels.
Description of Occurrence:
During corrective maintenance operations, an inspection of the subject valves shewed that the 8 cap screws which attach the motor opera-tors.to the' valve yoke adapter plate were loose on M0-2-10-89A.
A similar inspection on va lve M0-3-10-898 indicated that 4 of the G cap screws had
,,./
snapped just below the head.
8401260447 74120a WPi SENT REGIDM6 F*
PDR ADOCK 05000277 S
/~2
((M)
I
\\
Mr. A. Giambusso December 2, 1974 Page 2 Designation of Apparent Cause of Occurrence:
During operation, these valves are subject to vibration.
Analysis of Occurrence:
No failure of engineered safeguard equipment is associated with this particular occurrence. However, complete failure of all cap screws would render the valve inoperabic, and could allow the valve to move to the open posi tion.
In that case, it would be necessary to ter-minate flow through the failed valve by closing the up stream manual valve. This would be donc to maintain proper differentials between high pressure service water and RHR water.
Corrective Action:
The cap screws on M0-2-10-89A and MO-3-10-988 were replaced, torqued to the proper value and secured wi th LOC TITE. The remaining six (6) valves used in the same service will be inspected sequentially for similar defects.
The Philadelphia Electric Company, Mechanical Engineering Dcpartment, in concert with the Enginecr-Archi tect is investigating means of reducing pipe vibration on this system.
Failure Data:
None.
Very truly yours, Mw
),-
As/J.Cooney M.
s't Gen'1 Superintendent Generation Division cc:
Mr. J. P. O 'Rei lly Di rector, Region 1 United States Atomic Energy Commission 3
631 Park Avenue King of Prussia, PA 19406
.