ML033440328

Fwd: RAI Relating to STP - Loss of Power Amendment

ML033440328
Person / Time
Site:	South Texas
Issue date:	10/22/2003
From:	Jaffe D NRC/NRR/DLPM/LPD4
To:	Harrison A South Texas
Jaffe D, NRR/DLPM, 415-1439
References
Download: ML033440328 (4)

Text

I CAW1ND0WS\TEMP\GW100001.TMP Pagqe Paqe. 1 1 -S I C._._.A.. ..i... .A

.\WINDOWS..\TE..MP_.\G..WIOOOO1..-...

.,...TMP.... ....

.'... 1.-'_"'I''-

Mail Envelope Properties (3F96D502.8E5: 21: 21114)

Subject:

Fwd: RAI relating to STP -Loss of Power amendment Creation Date: 10/22/03 3:05PM From: David Jaffe Created By: DHJ@nrc.gov Recipients Action Date & Time stpegs.com Transferred 10/22/03 03:05PM awharrison (awharrison@stpegs.com)

Post Office Delivered Route stpegs.com Files Size Date & Time Mail MESSAGE 522 10/22/03 03:05PM Options Auto Delete: No Expiration Date: None Notify Recipients: No Priority: Standard Reply Requested: No Return Notification: None Concealed

Subject:

No Security: Standard To Be Delivered: Immediate Status Tracking: Delivered & Opened

Dai afe - Fwd: RAI relating to S§TP -Loss of Power amendment Pg From: David Jaffe To: awharrison @stpegs.com Date: 10122/03 3:05PM

Subject:

Fwd: RAI relating to STP -Loss of Power amendment Please call me. Thanks

I David Jaffe - RAI relating to STP -Loss of Power amendment Page 1 1 I -Loss Jaffe David - RAI of Power toSTP amendment relating Page 1~~~

From: John Knox To: Minns, John Date: 10/16/03 4:18PM

Subject:

RAI relating to STP -Loss of Power amendment Proposed questions are attached. Formal responses are needed to complete the SE.

In our review of a similar amendment request relating to loss of power instrumentation at Millstone, Ronaldo Jenkins raised a concern relating to the appropriateness of declaring the DG inoperable when the loss of power instrumentation is inoperable. There is nothing wrong with the DG; thus, it is inappropriate to declare the DG inoperable.

>>> David Jaffe 10/15/03 02:33PM >>>>

Section 2.0 ends with Table 1. Section 3.0 is "Background" but the forgot the "3.0,'. OK?

>>> John Knox 10/1 5/03 01:1 OPM>>>>

In regard to STP's letter dated September 22, 2003 (Ref :NOC-AE-03001 578) relating to proposed change to loss of power instrumentation TS, attachment 1 is missing part of sections 2.0 and 3.0. I do not need this information to write the rejection SE. It is already written and you have the SE, but we should have their complete submittal. Currently, Additional questions are being prepared based on information in their new submittal.

>>> John Minns 10/15/03 09:34AM >>>>

Please note that J Knox has informed me that the STP Loss of Power amendments will required an additional Tacs. Th licensee has submitted two different documents for the loss of power amendment.

Thanks John CC: ~~Jaffe, David; Jenkins, Ronaldo CC:

3 I David Jaffe - Question-r)hase2.wpd 1 Pacie111 Paae I David Jaffe Question-Dhase2.wDd

1. Response to question 1 (attachment 4) states "...the loss of power instrumentation relays perform a support function for the sequencer only for its functions to start and/or load its associated standby diesel generator (SDG) for those events involving a loss of off-site power. With the loss of power relays inoperable, the sequencer is still able to perform its function to sequence on safety injection loads for accidents not involving a loss of off-site power." With no loss of off-site power and with inoperable loss of power instrumentation (that is the loss of power instrumentation has failed such that it is doing its support function of sending a signal to start and load the DG), explain how the sequencer is still able to perform its function to sequence on safety injection loads for accidents not involving a loss of off-site power.

2. Response to question 1 (attachment 4) states "STPNOC's position is that the sequencer does not perform a support function for the offsite power." Pursuant with this position, provide a description of the analysis and its results demonstrating the offsite system is in compliance with the requirements of Criterion 17 of 10 CFR Part 50, Appendix A, without the support of the sequencer. Provide the description of the analysis and its results using applicable marked up FSAR pages.

3. The TS amendment request states that one channel of loss of power instrumentation has been removed from the scope of the Technical Specifications. Provide the basis and justification for this removal of one channel from Technical Specification pursuant to Criteria 1, 2, 3, and 4 of 10 CFR 50.36(c)(2)(ii).

4. Response to question 2 (attachment 4) states: "Even though the capability to trip the supply breaker is lost during a degraded or loss of voltage event due to an inoperable sequencer, the power distribution system is not inoperable as long as adequate voltage is supplied from the offsite system." Provide a description of the analysis and its results demonstrating that the power distribution system is in compliance with the requirements of Criterion 17 of 10 CFR Part 50, Appendix A, even though the capability to trip the supply breaker is lost during a degraded or loss of voltage event due to an inoperable sequencer. Provide the description of the analysis and its results using applicable marked up FSAR pages.

5. The TS amendment request indicates that the loss of power relays perform a support function for the sequencer only for its functions to start and/or load its associated standby diesel generator (SDG) for those event involving a loss of off-site power.

STPNOC considers opening of the offsite power supply breaker to be a function the sequencer performs as part of its function to start and load its associated SDG.

Inoperable loss of power instrumentation cause the sequencer and the offsite supply breaker to be inoperable; however, the ultimate effect of inoperable loss of power instrumentation is that the associated standby diesel generator will not load and is therefore inoperable. When loss of power instrumentation is inoperable, current TS cover the inoperable DG as well as the sequencer and offsite supply breaker. The proposed TS limits itself to an inoperable DG for the case when loss of power instrumentation is inoperable. The proposed TS does not cover the inoperable sequencer and offsite supply breaker. Provide the basis and justification for this removal of the sequencer and offsite supply breaker from Technical Specification pursuant to Criteria 1, 2, 3, and 4 of 10 CFR 50.36(c)(2)(ii) for when loss of power instrumentation is inoperable.