ML17303A594
| ML17303A594 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/01/1987 |
| From: | Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| 161-00552-JGH-P, 161-552-JGH-P, TAC-56591, TAC-65691, NUDOCS 8710050511 | |
| Download: ML17303A594 (6) | |
Text
REGULA INFORMATION DISTRIBUTIO PSTEM (RIDS)
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ACCESSION NBR: 87i00505ii DOC. DATE: 87/i0/Oi NOTARIZED: NO DOCKET 0 FACIL: STN-50-528 Palo Verde Nuclear Stations Unit ii Ari zona Pub STN-50-529 Palo Verde Nuclear Stationi Unit 2i *t izona Publi 05000529 li 05000528 STN-50-530 Palo Verde Nuc lear Stations Unit 3i Arizona Pub AUTH. NAME AUTHOR AFFILIATION li 05000530 HAYNES'. G. Arizona Nuclear Power Prospect (formerly Arizona Public Serv RECIP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Requests that once temp dependent shutdown margin amend issuedi implementation in Unit 3 be delayed until i wk after initially reaching i00/ power. Amends for Units i h 2 will be implemented within 30 days of issuance.
DISTRIBUTION CODE: AOOiD COPIES RECEIVED: LTR ENCL SIZE:
TITLE: OR Submittal: General Distribution NOTES: Standardized plant. 05000528 Standardized plant. 0500052'7 Standardized plant. 05000530 REC IP IENT COPIES REC IP IENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD5 LA PD5 PD LICITRAiE DAVIS' INTERNAL ACRS ARM/DAF/LFMB NRR/DEST/*DS NRR/DEBT/CEB NRR/DEST/MTB NRR/DEST/RSB NRR/DOEA/TSB N ILRB OGC/HDSi EG IL Oi RES/DE/EIB EXTERNAL: EG8cG BRUSKE> S LPDR NRC PDR NSIC NOTES:
TOTAL NUMBER OF COPIES REQUIRED: LTTR 29 ENCL
Arizona Nuclear Power Project P.o. BOX 52034 ~ PHOENIX, ARIZONA85072-2034 Docket Nos. STN-50-528/529/530 October 1, 1987 161-00552-JGH/PGN U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555
Reference:
PP39798 1/23/87 letter from J. Haynes (ANPP) to G. Knighton (NRC)
Subject:
Tech. Spec. Amendment Sections 1.0, 2.2, 3/4.1, 3/4.3, 3/4.10.
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2 and 3 Temperature Dependent Shutdown Margin Technical Specification Amendment File: 87-F-005-419.05 The referenced letter, submitted proposed changes to the PVNGS Units 1, 2 and 3 Technical Specifications to reduce the boration requirements when in shutdown, by modification of the shutdown margin requirements.
In addition to the shutdown margin requirements, the proposed changes will lower the trip setpoints and allowable values for "Excore Neutron Flux Logarithmic Power Level High", and the value at which the CPC trip may be manually bypassed and at which the manual bypass is automatically removed.
The Hi Log Power trip setpoint and the CPC bypass setpoint depend on Excore Log Power inputs. Past experience in- PVNGS Units 1 and 2 indicate the excore detectors are not as sensitive as design predicted, with the log power reading approximately a factor of seven lower than expected. Prior to reaching 100X power the setpoints are calibrated lower by a factor of seven to account for this. Upon reaching 100X power, the setpoints are correlated to calorimetric power.
The proposed Technical Specification amendment would lower the CPC bypass set-point and the Hi Log Power setpoint prior to the 100X power calibration, to a range which is susceptible to electronically coupled noise. Operating experience at PVNGS indicates the excore system is sensitive to noise and adopting the new setpoints prior to the 100X power level calibration could cause additional reactor and channel trips at low power.
Based on this, ANPP would like to request that once the temperature dependent shutdown margin amendment is issued, it not be implemented in PVNGS Unit 3 until one week after initially reaching 100X power. The amendments for PVNGS Uni'ts 1 and 2 will be implemented within 30 days of issuance.
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U . S . NRC Document Control Desk October 1, 1987 Page 2 161-00552-JGH/PGN If you have any questions or require additional information, please call M. F. quinn at (602) 371-4087.
Very truly yours, J.,G. Haynes Vice President
'Nuclear Production JGH/PGN/rw cc: 0. M. De Michele E. E. Van Brunt, Jr.
A. C. Gehr J. R. Ball J. B. Martin G. N. Knighton E. A. Licitra
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