ML20031E499

Forwards Request for Addl Info Justifying That Proposed Time Delays for Reactor Protection Sys Power Supply Monitor Trips Will Not Result in Damage to Reactor Sys Components

ML20031E499
Person / Time
Site:	Peach Bottom
Issue date:	09/16/1981
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Bauer E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
References
NUDOCS 8110160018
Download: ML20031E499 (4)

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MPTEMBER 1 61981 DISTRIBUTI"1

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Mr. Edward G. Bauer, Jr.

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Vice President and General Counsel ACRS-10 Q

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Philadelphia, Pennsylvanic 19101 JVanVliet ORAB

Dear Mr. Bauer:

Gray File

SUBJECT:

REACTOR PROTECTION SYSTEM (RPS) POWER MONITORING SYSTEM DESIGN MODIFICATION Your letter dated March 9, l?81 did not adequately respond to two of the six questions forwarded by our ietter of January 21. 1981. Specifically, you did not provide justification that proposed time delays for the RPS power supply monitor trips will not result in damage to RPS couponents, and you did not adequately address alternate power source monitoring.

These items were identified to your staff by conference call on August 25, 1981. Our original requcst is reiterated and amplified in enclosure (1).

Please provide the requested information as part of your October 31, 1981 submittal.

Enclosure (2) forwards, far your consideration, model Technical Specifications for Electric Power Monituring for RPS. If you select not to install a monitoring system for the alternate source (as explained in enclosure (1)),

your proposed Technical Specifications should include limiting conditions of operation (LCO) that address alternate source use. If, as a1 alternate to the LCO, you select to install an alternate source monitoring system, we request that you submit, concurrent with the response to enclosure (1),

the same type of design information as that which was required for the RPS motor-generator monitoring systens review.

Sincerely,

'URIGINAL SIGtgD B{,

NJ05F. STOEf6 John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing

Enclosures:

As Stated cc w/ enclosures:

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s Philadelphia Electric Company cc w/ enclosure (s):

Eugene J. Bradley Philadelphia Electric Company Regional Radiation Representative Assistant General Counsel EPA Region III 2301 Market Street Curtis Building (Sixth Floor)

Philadelphia, Pennsylvania 19101 6th and Walnut Streets Philadelphia, Pennsylvania 19106 Troy B. Conner, Jr.

1747 Pennsylvania Avenue, N.W.

M. J. Cooney, Superintendent Washington, D. C.

20006 Generation Division - Nuclear-Philade's ia Electric Company n

2301 *$-ket Street Phi'..,/ phia, Pennsylvania 19101 Government Publications Section inomas A. Ocming, Esq.

State Library of Pennsylvania Assistant Attorney General Education Building Department of Natural Resources Commonwealth and Walnut Streets Annapol,is, Maryland 21401 Harrisburg, Pennsylvania 17126 Philadelphia Electric Company ATTN: Mr. W. T. Ullrich Peach Sottom Atomic Power Station Mr. R. A. Heiss, Coordinator Delta, Pennsylvania 17314 Pennsylvania State Clearinghouse Governor's Office of State Planning Alcert R. Steel, Chairman and Development Board of Supervisors P. O. Box 1323 Peach Bottom Township Harrisburg, Pennsylvania 17120 R. D. #1 Delta, Pennsylvania 17314 Curt Ccwgill U.S. Nuclear Regulatory Ccmmission Office of Inspecticn and Enforcement Feach Sottom Atomic Power Station P. O. Box 399 Delta, Pennsylvania 17314 e

Enclesure 1 s

to ltr. dtd. 9/16/81 RPS POWER SUPPLY DESIGN MODIFICATION REQUEST FOR ADDITIONAL INFORMATION PEACH BOTTOM, UNITS 2 AND 3 1.

Provide justification that proposed time delays for the RPS power supply monitor trips will not result in degradation of RPS components (including relays and solenoid valves). Appropriate certifications by the RPS component manufacturers would suffice.

2.

The alternate power source, as proposed, will only have undervoltage monitoring and tripping at the 4160 volt level.

(Undervol tage relay setpoints (voltage.and. tim.e.. delay) should be chosen with.consid-eration given to RPS component capabilities as pointed out in

. question 1.). Howeyer,. overvoltage.4nd underfrequency.. which,

are detrimental to the designed operations of RPS relays and solenoid valves, are not monitored on the alternate power source.

It is, therefore, our position that :

(1) alternate power source use should be governed by a Limiting Condition of Operation (LCO);

or (2) two protective packages, similar to those on the motor generator outputs, should be installed. If you select to use an LCO, then alternate source use should be limited to a maximum of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> / month.

Please identify which of the above options will be selected for Peach Bottom.

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9/1 6/81 ELECTRICAL POWER SYSTEMS 3/4.8.2 ONSITE POWER DISTRIBUTION SYSTEMS ELECTRIC POWER MONITORING FOR REACTOR PROTECTION SYSTEM LIMITING CONDITION FOR OPERATION 3.8.2.7 The power monitoring system for the in service RPS MG set or Alternate Source shall be OPERABLE.

APPLICABILITY:

CONDITIONS 1 and 2.

ACTION:

With the pcwer conitcring system for the in service RPS MG set or Alternate

.Scurce inoperable, restore the inoperable power monitoring system to OPERABLE status within 30 minutes or remove the RPS MG set or ;1 ternate Source associated with the inoperable power monitoring system from service.

One channel of a po.ver monitoring system may be inop_ able, as necessary for test or maintenance, not to exceed 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> / month.

SUR'.'EILLANCE ' REQU IREMENTS 4.3.2.7 The above specified RPS power monitoring system instrumentation shall-be determined OPERABLE:

a.

At least once per six months by performing a CHANNEL FUNCTIONAL TEST; and b.

At least once per operating cycle by demonstrating the OPERABILITY.

of over-voltage, under-voltage and under-frequency protective instrumentation by performance of a CHANNEL CALIBRATION including simulated automatic actuation of the protective relays, tripping logic and output circuit breakers and verifying the following setpoints.

1.

Over-voltage <

VAC, 2.

Under-voltage 3, VAC, and 3.

Under-frequency 3, Hz.

.