ML20058E226
| ML20058E226 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/22/1982 |
| From: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Stolz S Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8207280101 | |
| Download: ML20058E226 (3) | |
Text
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PHILADELPHIA ELECTRIC COMPANY 23o1 MARKET STREET P.O. BOX 8699 PHILADELPHI A, PA.19101 SHIELDS L. DALTROFF ELECTn cpm ucTION July 22, 1982 Docket Nos. 50-277 50-278 l,
Mr. J. F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Stolz:
l Your letter of June 16, 1982, requested additional information concerning our proposed Technical Specifications on degraded grid voltage protection for Peach Bottom Units 2 and 3.
i Following are the items addressed in your letter and our responses.
(1)
The licensee had not documented in the Technical Specifications the time delay (with tolerances) associated with the CV6 and IAV relays which have a voltage setpoint of 87% (+ 5%) of 4160 volts and 60%
(+ 5%) of 4160 volts, respectively.
Discussion:
The time delay is required for surveillance requirements (i.e. calibration, etc.) If the time delay is not defined, then selection is at random and could be set at any value.- The licensee either must provide the i
time / voltage curve (s) or define selected point (s) with which the relay would be surveillanced at.
Ol$
l 8207280101 820722 l
PDR A00CK 05000277 P
i Mr. J. F. Stolz, Chief Page 2
RESPONSE
The time delays and tolerances for the CV6 and IAV relays will be as follows:
CV6: 30 seconds (+ 10%) at 2940 volts IAV: 1.8 seconds
(+ 10%) at 0 volts These settings will be incorporated into the Technical Specifications upon acceptance by the NRC staff.
(2)
The licensee has proposed no channel check surveillance and an extended functional test frequency of once per operating cycle for the degraded voltage protection system.
Discussion:
The model Technical Specifications defined the
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freauency of channel check as at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, i
and an instrument functional test on a monthly basis.
From the Standard Technical Specifications, it appears that the 1
majority of the instrumentation of the Engineered Safety Features system reflect this same frecuency of surveillance.
Therefore, the licensee should either submit in detail their justification for not providing and extending the recuired surveillance frecuencies or submit frequencies which meet those in the model Technical Specifications.
RESPONSE
We are presently obtaining reliability data to justify our position on these items.
We have contacted Southwest Research Institute to obtain NPRDS failure data for the relays we propose to use.
In addition, it is our understanding that the NRC staf f involved in review of our design was to send similar LER failure data in order for us to complete our evaluation.
Contingent upon receipt of the failure data by August 20, 1982, we will provide a complete response to this question by September 10, 1982.
(3)
Verification that the licensee has incorporated in their Technical Specifications LCO's and action statements for when the number of sensing channels are one less than the required minimum.
9
h I
Mr. J. F. Stolz, Chief Page 3
RESPONSE
The Limiting Conditions for Operation and action statements for when the number of sensing channels are one less than the required minimum are incorporated in the " Notes" for Table 3.2.B j
on page 72 of the present Technical Specifications.
(4)
Verification that the licensee has incorporated in their Technical Specifications tests which meet the requirements of NRC Staff Position 3 of the NRC letter dated June 2, 1977.
RESPONSE
l The requirements of NRC Staff Position 3 of the NRC letter dated June 2, 1977, are met in Technical Specification 4.9.A.l.b.
Details of the test to meet these requirements can be found in Peach Bottom Surveillance Test 11.6.
If you have any questions or require additional information, please don' t hesitate to call.
i Very truly yours, i
~
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' x) cc:
C. J. Cowgill Site Inspector I
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