ML20155B015
| ML20155B015 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/08/1986 |
| From: | Medford M SOUTHERN CALIFORNIA EDISON CO. |
| To: | Chaffee A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| Shared Package | |
| ML20155B019 | List: |
| References | |
| TAC-62010, NUDOCS 8604100181 | |
| Download: ML20155B015 (3) | |
Text
-
Mir
- s+
Southem Califomia Ed/ son Company P. O. BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALtFORNIA 91770 MANAGER. NUCLEAR UCENSING 19981 302-1749 April 8, 1986 Mr. A. E. Chaffee, Regulatory Projects Branch U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596 Gentlemen:
Subject:
Docket No. 50-206 Investigation Report of November 21, 1985 Water Hammer Event San Onofre Nuclear Generating Station, Unit 1
References:
1.
Letter from George E. Lear (NRC) to Kenneth P. Baskin (SCE),
Request for Information Needed for NRC Review of November 21, 1985 Event at San Onof re Unit 1, March 17,1986 2.
Letter from D. F. Kirsch (NRC) to Kenneth P. Baskin (SCE),
March 21, 1986 3.
Letter from George E. Lear (NRC) to Kenneth P. Baskin (SCE),
Request for Additional Information, March 25, 1986 4.
Letter from M. O. Medford (SCE) to A. E. Chaffee (NRC),
Evaluation of November 21, 1985 Loss of Power and Water Hammer Event, San Onofre Nuclear Generating Station, Unit 1, March 2, 1986 Provided as an enclosure to this letter is SCE's report documenting the results of our investigations to date, into the November 21, 1985 Water Hammer Event at San Onofre Unit 1.
This report describes the SCE post-event investigations, the conclusions of those investigations and the corrective actions that are being implemented as a result of the investigations.
In addition, the enclosed report specifically responds to the information requested from NRR and I&E in Reference 1 and to the information requested from Region V in Enclosure 2 to Reference 2.
Cross references between the individual information requests and the appropriate sections of the report are included in Appendix A.
h ema me p$'
- g
.I, s
Mr. A. E. Chaffee April 8, 1986 With respect to the information request of Reference 3, while some of the information is addressed in the enclosed report, a separate response to this request will be provided by April 30, 1986.
This supplementary response will also include the results of our ongoing evaluations of swing check valves in the plant as discussed in Enclosure 5 to Reference 4.
If you have any questions regarding the enclosed information, please contact me.
Sincerely, b..
Enclosure cc:
Mr. G. E. Lear, Director, PWR Project Directorate No. 1 Mr. Gary Zech, Office of Investigation and Enforcement Mr. F. R. Huey, NRC Senior Resident Inspector, SONGS 1, 2&3 a
a
[
.f Southem Califomia Edison Company P. O BOX 800 2244 WALNUT GROVE AVENUE ROSEMEAD. CALIFORNIA 91770 MANAGER, NUCLEAR LICENSING (SIS) 302 t 749 April 8, 1986 Mr. A. E. Chaffee, Regulatory Projects Branch U.S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 210 Walnut Creek, CA 94596 Gentlemen:
Subject:
Docket No. 50-206 Investigation Report of November 21, 1985 Water Hammer Event San Onofre Nuclear Generating Station, Unit 1
References:
1.
Letter from George E. Lear (NRC) to Kenneth P. Baskin (SCE),
Request for Information Needed for NRC Review of November 21, 1985 Event at San Onofre Unit 1, March 17, 1986 2.
Letter from D. F. Kirsch (NRC) to Kenneth P. Baskin (SCE),
March 21, 1985 3.
Letter from George E. Lear (NRC) to Kenneth P. Baskin (SCE),
Request for Additional Information, March 25, 1986 4.
Letter from M. O. Medford (SCE) to A. E. Chaffee (NRC),
Evaluation of November 21, 1985 Loss of Power and Water Hammer Event, San Onofre Nuclear Generating Station, Unit 1, March 2, 1986
(
Provided as an enclosure to this letter is SCE's report documenting the results of our investigations to date, into the November 21, 1985 Water Hammer Event at San Onofre Unit 1.
This report describes the SCE post-event investigations, the conclusions of those investigations and the corrective actions that are being implemented as a result of the investigations.
In addition, the enclosed report specifically responds to the information requested from NRR and I&E in Reference 1 and to the information requested from Region V in Enclosure 2 to Reference 2.
Cross references between the individual information requests and the appropriate sections of the report are included in Appendix A.
Mr. A. E. Chaffee April 8, 1986 With respect to th'e information request of Reference 3, while some of the information is addressed in the enclosed report, a separate response to i
this request will.be provided by April 30, 1986. This supplementary response will also includc the results of our ongoing evaluations of swing check valves in the plant as discussed in Enclosure 5 to Reference 4.
If you have any questions regarding the enclosed information, please contact me.
Sincerely, h.h.h Enclosure Mr. G. E. Lear, Director, PWR Project Directorate No.1 '
cc:
Mr. Gary Zech, Office of Investigation and Enforcement Mr. F. R. Huey, NRC Senior Resident Inspector, SONGS 1, 2&3
.