ML18219D181
| ML18219D181 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 05/09/1975 |
| From: | Dolan J American Electric Power Service Corp |
| To: | James Keppler NRC/RGN-III |
| References | |
| Download: ML18219D181 (6) | |
Text
NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORi'//)
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CONTROL NO:~
FILE'ROM.American
- Elec, Power Co New York, N.Y.
John E, Dolan TO:
NRC 5-9-75 ORIG 1 Kigned 5 12~75 CC OTHER DATE OF DOC DATE REC'D LTR XX TWX RPT SENT AEC PDR SENT I.OCAL PDR OTHFR CLASS UNCLASS XXX DESCRIPTION:
PROPINFO 'NPUT NO CYS REC'D ENCLOSURES:
DOCKET NO:
50-315
- Ltx, Re our ltr, of 3-14-75...o& their ltr, of 4-14
~., furnishing inform. ref. System capabilities and operating proceduxes to assure that boron precipitaiion would not compromise logn-tera Core Cooling capability following a LOCA. ~ ~ ~ ~ ~
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AMERICAN ELECTRIC POWER Service Corporation 2 Broaduay, New York, K Y. )0004 (212) 422.4800 JOB)r E. DOr QT Ezcdfairc Tied Prrdidcnt Esginnrisg e Cdsdtructiou May 9) 1975 Docket No. 50-315 DPR-58 s,
"Cp s e rp'p U.S.,Nuclear Regulatory Commission Directorate of Regulatory Operations Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Attention:
Mr. J'ames G. Ke ler Re Gentlemen:
8-'j INA'3.""a--
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.r 4 g r
ional Director By letter dated March 14.,
1975 Mr. Karl Kniel, Chief of Light Mater Reactors Branch 2-2, Division of Reactor Licensing, U.S. Nuclear Regulatory Commission, requested that we review cur /system capabilities aud operating procedures)to assure that boron precipitation would not compromise long-term core cooling capability following a LOCA.
This review was to consid.er all aspects of the design including component qualification in the LOCA environment.
In our April 14, 1975 response letter to Karl Kniel, we indicated that we were currently investigating the environmental effects on motor drives for valves which are used to transfer from cold to hot leg injection.
A copy of both letters are attached for your information.
Mr. Kniel was informed of the results of our investigation in a telephone conversation on May 2, 1975.
Mr. Ken Baker of your office was also. notified on the same day.
This letter transmits the results of our investigations.
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J.
G. Keppler May 9~ 1975 Ne have determined that on the Donald C. Cook Nuclear Plant, Unit No. 1, the motor operators'urrently installed on the transfer valves are not specifically designed to operate in the Post-LOCA environment as they have Class "B" insulation which is rated for 150~F service.
- However, we believe that the motor operators now installed will function as required.
As we described in pages 7.5-16 thru 7.5-18 of the Cook Nuclear Plant FSAR and where we.referred to Nestinghouse NCAP-7410L, Nestinghouse ran tests on both Class RH and Class B motor operators subjected to Post LOCA conditions.
The Class B
Operator survived the 1st day of exposure with 12 complete reversing cycles and did not fail to operate until more than 5 days of exposure.
Our valves only need to operate
- once, approximately 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the accident.
Ne have replacement "Class RH" motor operators available on site and plan to replace the existing operators of the 4 valves involved.
These replacement motor operators are designed and qualified for the post LOCA environment.
The replacement will be done at the, next outage.
Xn the interim, both the vendor of the currently installed motor operators and our engineering staff are confident that the valve operators now in place will function at least once after being subjected to the post LOCA environment for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Very truly yours, JED:ma Enclosure John E. Dolan Ex tive Vice President Engineering and Construction cc:
Gerald Charnoff Richard Nalsh Robert J. Vollen Robert C. Callen Peter N. Steketee R.
N. Jurgensen
- Bridgman R.
S. Hunter K. Kniel - NRC
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