ML080520364: Difference between revisions
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{{#Wiki_filter: | {{#Wiki_filter:Ross T. Ridenoure JSOUTHERN EDISON' CALIFORNIA VP and Site Manager San Onofre Nuclear Generating Station An EDISON INTERNATIONAL Company February 19, 2008 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001 | ||
==Subject:== | ==Subject:== | ||
Docket Nos. 50-361 and 50-362 Response to Request for Additional Information on the Proposed Amendment for Loss of Voltage Signal (LOVS) Relay Replacement, Proposed Change Number (PCN) 577 (TAC Nos. MD5112 and MD5113) | |||
San Onofre Nuclear Generating Station, Units 2 and 3 | |||
==Reference:== | ==Reference:== | ||
March 30, 2007 letter from B. Katz (SCE) to Document Control Desk (NRC), | |||
==Subject:== | ==Subject:== | ||
| Line 30: | Line 31: | ||
==Dear Sir or Madam:== | ==Dear Sir or Madam:== | ||
By letter dated March 30, 2007 Southern California Edison (SCE) submitted the referenced Proposed Change Number (PCN)-577, LOVS Relay Replacement. | |||
In an e-mail message dated January 16, 2008, NRC staff requested additional information regarding the submittal. | By letter dated March 30, 2007 Southern California Edison (SCE) submitted the referenced Proposed Change Number (PCN)-577, LOVS Relay Replacement. In an e-mail message dated January 16, 2008, NRC staff requested additional information regarding the submittal. The NRC staff question and the SCE response are contained in the enclosure. | ||
The NRC staff question and the SCE response are contained in the enclosure. | |||
The only commitment contained herein is to the action stated in the enclosure. | The only commitment contained herein is to the action stated in the enclosure. | ||
If you have any questions or require additional information, please contact Ms. Linda T.Conklin at (949) 368-9443.Sincerely, | If you have any questions or require additional information, please contact Ms. Linda T. | ||
Conklin at (949) 368-9443. | |||
Sincerely, | |||
==Enclosure:== | ==Enclosure:== | ||
As Stated Mail Drop D45 P.O. Box 128 San Clemente, CA 92672 949-368-6255 PAX 86255 A-60 f Fax: 949-368-6183 Ross.Ridenoure@sce.com | |||
Document Control Desk February 19, 2008 cc: E. E. Collins, Regional Administrator, NRC Region IV N. Kalyanam, NRC Project Manager, San Onofre Units 2 and 3 C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2 and 3 S. Y. Hsu, California Department of Public Health, Radiological Health Branch | |||
ENCLOSURE NRC QUESTION The licensee's plant procedures should meet the requirements specified in Notes 1 and 2 of the September 7, 2005 NRC letter to the Nuclear Energy Institute Setpoint Methods Task Force, including the clarifications provided in Section 4 of the letter. | |||
SCE RESPONSE SCE commits to the following: | |||
If the as-found relay setpoint is conservative with respect to the Allowable Value but outside its predefined as-found acceptance criteria band, then the relay shall be evaluated to verify that it is functioning as required before returning the relay to service. If the as-found relay setpoint is not conservative with respect to the Allowable Value, the relay shall be declared inoperable. | If the as-found relay setpoint is conservative with respect to the Allowable Value but outside its predefined as-found acceptance criteria band, then the relay shall be evaluated to verify that it is functioning as required before returning the relay to service. If the as-found relay setpoint is not conservative with respect to the Allowable Value, the relay shall be declared inoperable. | ||
The relay setpoint shall be reset to a value that is within the as-left tolerance of the nominal relay setpoint; otherwise, the relay shall be declared inoperable. | The relay setpoint shall be reset to a value that is within the as-left tolerance of the nominal relay setpoint; otherwise, the relay shall be declared inoperable. | ||
If the as-found trip setpoint (TSP) is found to be non-conservative with respect to the allowable value (AV) specified in the Technical Specifications (TSs), the relay shall be declared inoperable and the associated TS action statement followed.If the as-found TSP is found to be conservative with respect to the AV, and outside the as-found predefined acceptance criteria band, but SCE is able to determine that the relay is functioning as required and can be reset to within the setting tolerance of the limiting TSP, or a value more conservative than the limiting TSP, then the relay may be considered operable. | If the as-found trip setpoint (TSP) is found to be non-conservative with respect to the allowable value (AV) specified in the Technical Specifications (TSs), the relay shall be declared inoperable and the associated TS action statement followed. | ||
If it cannot be determined that the relay is functioning as required, it shall be declared inoperable and the associated TS actions followed.If the as-found TSP is outside the as-found predefined acceptance criteria band, the condition shall be entered into the corrective action program for further evaluation. | If the as-found TSP is found to be conservative with respect to the AV, and outside the as-found predefined acceptance criteria band, but SCE is able to determine that the relay is functioning as required and can be reset to within the setting tolerance of the limiting TSP, or a value more conservative than the limiting TSP, then the relay may be considered operable. If it cannot be determined that the relay is functioning as required, it shall be declared inoperable and the associated TS actions followed. | ||
If the as-found TSP is outside the as-found predefined acceptance criteria band, the condition shall be entered into the corrective action program for further evaluation. | |||
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Latest revision as of 20:15, 14 November 2019
| ML080520364 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 02/19/2008 |
| From: | Ridenoure R Southern California Edison Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| TAC MD5112, TAC MD5113 | |
| Download: ML080520364 (3) | |
Text
Ross T. Ridenoure JSOUTHERN EDISON' CALIFORNIA VP and Site Manager San Onofre Nuclear Generating Station An EDISON INTERNATIONAL Company February 19, 2008 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
Subject:
Docket Nos. 50-361 and 50-362 Response to Request for Additional Information on the Proposed Amendment for Loss of Voltage Signal (LOVS) Relay Replacement, Proposed Change Number (PCN) 577 (TAC Nos. MD5112 and MD5113)
San Onofre Nuclear Generating Station, Units 2 and 3
Reference:
March 30, 2007 letter from B. Katz (SCE) to Document Control Desk (NRC),
Subject:
San Onofre Nuclear Generating Station Units 2 and 3, Docket Nos. 50-361 and 50-362, Proposed Change Number (PCN)-577, LOVS Relay Replacement
Dear Sir or Madam:
By letter dated March 30, 2007 Southern California Edison (SCE) submitted the referenced Proposed Change Number (PCN)-577, LOVS Relay Replacement. In an e-mail message dated January 16, 2008, NRC staff requested additional information regarding the submittal. The NRC staff question and the SCE response are contained in the enclosure.
The only commitment contained herein is to the action stated in the enclosure.
If you have any questions or require additional information, please contact Ms. Linda T.
Conklin at (949) 368-9443.
Sincerely,
Enclosure:
As Stated Mail Drop D45 P.O. Box 128 San Clemente, CA 92672 949-368-6255 PAX 86255 A-60 f Fax: 949-368-6183 Ross.Ridenoure@sce.com
Document Control Desk February 19, 2008 cc: E. E. Collins, Regional Administrator, NRC Region IV N. Kalyanam, NRC Project Manager, San Onofre Units 2 and 3 C. C. Osterholtz, NRC Senior Resident Inspector, San Onofre Units 2 and 3 S. Y. Hsu, California Department of Public Health, Radiological Health Branch
ENCLOSURE NRC QUESTION The licensee's plant procedures should meet the requirements specified in Notes 1 and 2 of the September 7, 2005 NRC letter to the Nuclear Energy Institute Setpoint Methods Task Force, including the clarifications provided in Section 4 of the letter.
SCE RESPONSE SCE commits to the following:
If the as-found relay setpoint is conservative with respect to the Allowable Value but outside its predefined as-found acceptance criteria band, then the relay shall be evaluated to verify that it is functioning as required before returning the relay to service. If the as-found relay setpoint is not conservative with respect to the Allowable Value, the relay shall be declared inoperable.
The relay setpoint shall be reset to a value that is within the as-left tolerance of the nominal relay setpoint; otherwise, the relay shall be declared inoperable.
If the as-found trip setpoint (TSP) is found to be non-conservative with respect to the allowable value (AV) specified in the Technical Specifications (TSs), the relay shall be declared inoperable and the associated TS action statement followed.
If the as-found TSP is found to be conservative with respect to the AV, and outside the as-found predefined acceptance criteria band, but SCE is able to determine that the relay is functioning as required and can be reset to within the setting tolerance of the limiting TSP, or a value more conservative than the limiting TSP, then the relay may be considered operable. If it cannot be determined that the relay is functioning as required, it shall be declared inoperable and the associated TS actions followed.
If the as-found TSP is outside the as-found predefined acceptance criteria band, the condition shall be entered into the corrective action program for further evaluation.
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