ML18081A599

Forwards Response to NRC 791030 Ltr.Response Includes Description of Proposed Methods for Implementation of short- Term Lessons Learned Requirements W/Which Util Disagrees

ML18081A599
Person / Time
Site:	Salem
Issue date:	11/23/1979
From:	Librizzi F Public Service Enterprise Group
To:	Eisenhut D Office of Nuclear Reactor Regulation
References
NUDOCS 7911270311
Download: ML18081A599 (5)

Text

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OPS~~

Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201/430-7000 November 23, 1979 Director of Nuclear Reactor Regulation

u. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Mr. D. G. Eisenhut, Acting Director Division of Operating Reactors Gentlemen:

LESSONS LEARNED SHORT TERM REQUIREMENTS NO. 1 UNIT SALEM NUCLEAR GENERATING STATION DOCKET NO. 50-272 Public Service Electric and Gas Company hereby submits its response to your letter of October 30, 1979, which provided additional clarification of the NRC's short term Lessons Learned requirements.

The information contained in the attachment to this letter provides a detailed description of our proposed methods of implementation for those items where we are not in complete agreement with your requirements, along with a justification for the differences, as requested.

The attachment to this letter is applicable to both No. 1 and No. 2 Units of the Salem Nuclear Generating Station and is responsive to your concerns. This information has been transmitted under a separate cover to the Acting Director, Division of Project Management for the Salem No. 2 Unit (Docket No. 50-311).

Should you have any questions in this regard, please do not hesitate to contact us.

Very truly yours,

'~~

-p,.p~

General Manager -

Electric Production EAL:gs Attach.

The Energy People 95-0942

( __, .')

DISCUSSION OF ALTERNATIVES TO NRC STAFF REQUIREMENTS LESSONS LEARNED IMPLEMENTATION NOS. 1 AND 2 UNITS SALEM NUCLEAR GENERATING STATION M P79 57 15/3

PRESSURIZER HEATER POWER SUPPLY (2.1.l)

Clarification 4:

Any change-over of the heaters from normal offsite power to emergency onsite power is to be accomplished manually in the

• control room.

Proposed Alternate:

The connection of the pressurizer heaters to a vital bus is made through a normally open Class lE circuit breaker. This circuit breaker is mechanically key interlocked with the normal, non-vital power feed circuit breaker. A manually opened disconnect switch ml.ist also be closed to. make the connection. Once the connection pathway is established manually, the final connection of the pressurizer heaters to the vital bus (open/close the Class lE circuit breaker) is accomplished in the control room. The setup of the vital bus feed to the pressurizer heaters can be completed in a time frame consistent with maintenance of natural circulation.

The manual action of opening the non-vital supply circuit breaker prior to closing the vital power supply circuit breaker by mechanical key interlocks is necessary to eliminate any possibility of feeding other non-vital loads from*the vital power supply.

M P79 57 15/4 Salem l & 2

PRESSURIZER RELIEF AND BLOCK VALVES POWER SUPPLY (2.1.1)

Clarification 2:

The motive and control power for the block valve should be supplied from an emergency power bus different from that which supplied the PORV.

Proposed Alternate:

The design of the pressurizer relief and block valve arrangement for both Salem units was predicated on ensuring the ability to relieve. This concept resulted in providing two parallel relief paths which are completely independent and redundant. Such a design concept is necessary to provide protection for ATWS conditions and low temperature overpressure transients.

Incorporation of complete independence between the relief valve and block valve would negate the system's ability to meet the single-failure criterion for the events identified above. The existing design, however, does incorporate the use of diverse power supplies for the PORV's and their associated block valves. The relief valves are supplied by Class lE, 125VDC systems while the block valves use 230V and 115V vital AC.

There is no requirement for provisions to switch from normal power to emergency onsite power for these devices since the normal power supply in all cases is part of the onsite vital power system.

M P79 57 l*s;s Salem 1 & 2

_i)

AFW FLOW INDICATION (2.1.7.b.)

1 I

Clarification B.l:

Auxiliary feedwater flow indication to each steam generator shall satisfy safety-grade requirements.

Proposed Alternate:

The Salem design incorporates auxiliary feedwater flow indication for each steam generator. One flow instrument for each steam generator is provided. In addition, three level instruments are provided for each steam generator.

The instruments are all pbwered from the vital buses, seismically qualified with environmental qualification for the level instruments which are located inside the.

containment. The present Salem design meets the NRC short term requirements.

The long term requirements for redundant flow indication do not appear to be warranted. Assurance of sufficient water being provided to the steam generators is of primary con-cern. Operator action is taken to maintain steam generator level rather than to assure a particular gpm flow rate.

This is accomplished by control of valve demand with steam generator level indication. The use of auxiliary feedwater flow is not an absolute necessity. Its loss will not affect the primary objective. Present indiction of pump operation, valve demand/position, auxiliary feedwater flow (one/steam generator), auxiliary feedwater discharge pressure and steam generator level (three/steam generator) is adequate to meet the information requirements necessary to assure appropriate operator action.

M P79 57 15/6 Salem l & 2