ML20086H782
| ML20086H782 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 06/19/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20086H786 | List: |
| References | |
| AO-75-42, NUDOCS 8401200238 | |
| Download: ML20086H782 (2) | |
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PHILADELPHIA ELECTRIC COMPANY s
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2301 MARKET STREET
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PHILADELPHIA. PA.19101 12151 841 4o0o s
June 19, 1975
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Mr. A. Giambusso, Director
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Division of Reactor Licensing Office of Nuclear Reactor Regulations
- United States Nuclear Regulatory Commission Washington, D.C.
20555 i
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack,
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Region 1, Office of Inspection and Enforcement, United States Nuclear Regulatory Connission on June 10, 1975. Written notification was made to Mr. James P. O'Reilly, Office of Inspection and Enforcement, Region 1, United States Nuclear Regulatory Commission on June 10, 1975.
In accordance with Section 6.7.2.A of the Technical Speci fications, Appendix A of DPR-44 for Unit 2 Peach Bottom Atomic Power Station, the following occurrence is being submitted to the Directorate of Reactor o
Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-44 Techni, cal Speci fication
Reference:
3.5.B Report No.:
50-277-75-42 Report Date:
June 19, 1975 Occurrence Date: June 9, 1975 Faci li ty:
Peach Bottoni Atomic Power Station R.D. # 1, Delta,, annsylvania 17314 Identi fication of Occurrence:
l Failure of containment spray valve operator (M0-318).
Conditions Prior to Occurrence:
l Unit 2 at 50% power.
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Description of Occurrence:
On June 7,1975 the Unit 2
'B' containment spray inner valve (MO-318) was identified as electrically inoperable during the per-formance of a routine surveillance test. The investigation completed on June 9,1975 showed that the bolts which attach the valve yoke to i
the valve body had failed. The valve was found in an open position.
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8401200238 750619 DR ADOCK 05000 COPY SENT llEGION m
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O Mr. A. Giambusso 50-277-75-42,.
q June 19, 1975 P6ge' 2 Designatiok of Apparent Cause of Occurrence:
Eailure appears to have been caused by a naifunction of the valve limi torque operator.
Investigation is continuing.
Analysis of Occurrence:
- This occurrence has minimal safety significance since all containment cooling sub-system loops were operable even with this valve out of service and open.
Following a LOCA, containment cooling is achieved by circulation of torus water through the RHR heat ex-changer and back to the torus. Heat is renoved via. the high pressure service water system using the RHR heat exchanger. The requi renent l
for the containment spray is an option availeble to the reactor oper-ator and must be initiated manually. Containment spray capabilit'y was available via the 'A8 loop containment spray valves ?nd by opening the b
outer 888 loop containment spray valves.
Since the failure of the 'Bt containment spray inner valve, the outer valve' in the same line has remained closed. This prevents any possible containment leakage.
Corrective Action:
i Investigation to dato revealed a failed motor rotor and sane malfunction of the limitorque valve operator or limit switch assembly.
Replacement parts are on order and investigation is continuing.
Until repairs can be made, the valve will be maintained open l
and the outer 888. loop containment spray valve shall remain closed (M0-268) and shall be logged in this position daily. The RHR contain-l ment cooling system is considered fully operable in this condition since both containment spray and suppression pool cooling flow paths can be initiated if requi red.
Very truly yours,
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M. J. Cooney A st. Gen 1. Supt.
Generation Division cc:
Mr. James P. O'Reilly, Di rector Office of Inspection and Enforcement i.
Region 1 l
Uni ted States Nuclear Regulatory. Commission 1
631 Park Avenue L
King of Prussia,- PA 19406 i
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