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
DOCKET 0 05000528 05000529 05000530
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 REGULA INFORMATION DISTRIBUTIO PSTEM (RIDS)
/
ACCESSION NBR: 87i00505ii DOC. DATE: 87/i0/Oi NOTARIZED:
NO FACIL:STN-50-528 Palo Verde Nuclear Stations Unit ii Arizona Pub li STN-50-529 Palo Verde Nuclear Stationi Unit 2i *t izona Publi STN-50-530 Palo Verde Nuc lear Stations Unit 3i Arizona Pub li AUTH. NAME AUTHOR AFFILIATION HAYNES'. G.
Arizona Nuclear Power Prospect (formerly Arizona Public Serv RECIP. NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
NOTES: Standardized plant.
Standardized plant.
Standardized plant.
05000528 0500052'7 05000530 REC IP IENT ID CODE/NAME PD5 LA LICITRAiE INTERNAL ACRS NRR/DEST/*DS NRR/DEST/MTB NRR/DOEA/TSB OGC/HDSi RES/DE/EIB COPIES LTTR ENCL REC IP IENT ID CODE/NAME PD5 PD DAVIS' ARM/DAF/LFMB NRR/DEBT/CEB NRR/DEST/RSB N
ILRB EG IL Oi COPIES LTTR ENCL EXTERNAL:
EG8cG BRUSKE> S NRC PDR NOTES:
LPDR NSIC 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 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 October 1, 1987 161-00552-JGH/PGN
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.
871005051l 87>00>
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U. S.
NRC Document Control Desk Page 2
October 1, 1987 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.
E. E.
A. C.
J.
R.
J.
B.
G. N.
E. A.
De Michele Van Brunt, Jr.
Gehr Ball Martin Knighton Licitra
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