ML17299B254
| ML17299B254 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 05/27/1986 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| ANPP-36693EEVB, TAC-61574, TAC-61575, NUDOCS 8606020158 | |
| Download: ML17299B254 (6) | |
Text
REQULA Y INFORl'1ATION DISTR IBUTI SYSTE!'1 (R IDS)
DOCKET 0 05000528 05000529
SUBJECT:
Submits one-time only request for 48 h relief from Limiting Condition for Operation
- 3. 0. 3 to alloui 'plants to remain at power while emergencg Tech Spec r,hange prepared 5 corrective steps implemented to change setpoint setting.
DISTRIBUTION CODE:
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ACCESSION NBR: 8606020i58 DOC. DATE: 86/05/27 NOTARIZED:
NO FACIL:STN-50-528 Palo Verde Nuclear Stationi Unit ii Arizona Publi STN-50-529 Palo Verde Nuclear Station>
Unit 2i Arizona Publi AUTH, NAl'1E AUTHOR AFFILIATION, VAN BRUNT'. E.
Arizona Nuclear Power Prospect
( formerly Arizona Public Serv RECIP. NAl'1E RECIPIENT AFFILIATION KNIQHTON> Q. W.
PWR Prospect Directorate 7
NOTES:Standardi.zed plant.
Standardized plant.
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PHOENIX. ARIZONA85072-2034 ANPP-36693EEVB/ JRP/98. 05 May 27, 1986 Director of Nuclear Reactor Regulation Attention:
Mr. George W. Knighton, Project Director PWR Project Directorate 87 Division of Pressurized Water Reactor Licensing B U. S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1 and 2
Docket No.
STN SO-S28 (License NPF-41)
Docket No.
STN 50-529 (License NPF-51)
Request for Emergency Technical Specification Change File:
86-056&26
Dear Mr. Knighton:
Per conversation with you and your staff on May 27,
- 1986, submitted herewith is a
one-time only request for 48-hour relief from Limiting Condition for Operation 3.0.3; which states in part "when a Limiting Condition for Operation is not met, except as provided in the associated ACTION requirements, within 1
- hour, action shall be initiated to place the unit in a MODE in which the specification does not apply by placing it; as applicable, in:
The requested relief will allow PVNGS to remain at power wh1le an Emergency Technical Specification change is prepared and corrective steps are implemented to change setpoint settings allow1ng continued operation.
During investigation of channel trips associated with the low reactor coolant flow trip, it was discovered that two of the three parameters set in the trip are in violation of Technical Specification Table 2.2-1.
Specifically, the RATE and BAND setpoints are not conservative whenever the measured average S/G differential pressure is below 22.5 psid.
- However, the FIOOR setpoint provides the necessary protective action within the time frames assumed in the applicable safety analyses.
The assumed values in the setpoint calculat1on for the
- FLOOR, RATE and BAND setpoints are based on a range of differential pressure of 22.5 psid to 30.0 psid.
The actual measured maximum value of differential pressure was 26.5 paid, which makes the FLOOR setting conservatively high.
The actual measured minimum value of differential pressure which determines the RATE and BAND settings was 17.5
- psid, which makes the rate and band settings non-conservative.
- However, after evaluation of this condition by Combustion Engineer1ng we have determined that the FLOOR setting will provide adequate protection within safety analysis values.
8606020i58 860527 PDR ADOCK 05000528, P
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Mr. George Knighton Request for Emergency Technical Specification Change ANPP-36693 Page 2
Appropriate fees will be provided in a followup letter.
Your prompt response is requested.
Very truly yours, VcxJ~
n~
E. E. Van Brunt, Jr.
Executive Vice President Project Director EEVB/WFQ/)le cc:
Director region V, USNRC NRC Prospect Manager E. A. Licitra NRC Resident Inspector R.
P.
Zimmerman A. C. Gehr C. Tedford, Director (ARRA)
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