ML17303A188
| ML17303A188 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 12/19/1986 |
| From: | Haynes J ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| ANPP-39452-JGH, TAC-64506, TAC-64507, TAC-64508, NUDOCS 8612310036 | |
| Download: ML17303A188 (8) | |
Text
REGULATORY NFORNATIQN DISTRIBUTION 8
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ACCESSION NBR: 8612310036 DQC. DATE: 86/12/19 NOTARIZED:
NQ DOCKET FACIL:STN-50-528 Palo Verde Nuclear Stati one Unit }i Arizona Pub li 05000528 STN-50-529 Palo Verde Nuclear Stationi Unit 2i Arizona Pub li 05000529 STN-50-530 Palo Verde Nuclear Station>
Uni't 3i Arizona Publi 05000530 AUTH. NAI'lE
'UTHOR AFFILIATION HAYNES> J. G.
Arizona Nuclear Power Prospect (formerly Arizona Public Serv REC IP. NANE RECIPIENT AFFILIATION KNIQHTQN> G. M.
PMR Prospect Directorate 7
SUBJECT:
Requests review 5 approval of facilities Cycle 1 core protection calc Ula'tor algol lthm mod s. Core protect ion calculator software algorithm 5 executive program changes enc l.
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Arizona Nuclear Power Project P.o. BOX 52034 o
PHOENIX, ARIZONA85072-2034 December 19, 1986 ANPP-39452-JGH/LJM/98.05 Director of Nuclear Reactor Regulation Attention:
Mr. George W. Knighton, Project Director PWR Project Directorate 0'7 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, 2 and '3 Docket Nos.
STN 50-528 (License NPF-41)
STN 50-529 (License NPF-51)
STN 50-530 PVNGS Cycle 1 Core Protection Calculator (CPC)
Software Modifications File: 86-056-026
Dear Mr. Knighton:
ANPP is planning to implement the CPC software modifications identified in Attach-ment 1.
These algorithm changes are described in detail in CEN-281(S)-P, Revision 01-P, CPC/CEAC Software Modifications for San Onofre Nuclear Generating Station 2
and 3,
- November, 1984, and were first reviewed by the staff for San Onofre Nuclear Generating Station 2
and 3.
We are requesting your review and approval of the same algorithm modifications as described in CEN-281(S)-P for PVNGS Unit 1,
2 and 3.
This description is directly applicable to PVNGS.
The changes are being made to enhance operation throughout the cycle and reduce the occurrence of unnecessary trips.
With these modifications, ANPP will be implementing one component of the currently planned efforts to improve the CPC system performance and mitigate the problems caused by the flow projected Depar-ture from Nucleate Boiling Ratio (DNBR) trip algorithm being too sensitive to underfrequency events.
Your response to these changes is needed by February 1,
- 1987, to insure there will be no significant impact to the operation of Unit 1, Cycle 1.
In addition to the algorithm modifications described
- above, we plan to correct the CPC Executive program problems which were identified during startup testing.
These changes are summarized in Attachment 1.
The Executive program changes do not hffect the Departure from Nucleate Boiling Ratio/Local Power Density (DNBR/LPD) Calculations
- and, therefore, are not important to safety and will be reviewed per 10 CFR 50.59, Unreviewed Safety questions.
861231003b 861219 PDR ADOCK 05000528 P
5
Mr. George M. Knighton
Subject:
Software Modifications ANPP-39452 Page 2
Xf you should have any questions concerning this matter, contact Mr.
M. F. Quinn of my staff.
Very truly yours, J.
G. Haynes Vice President Nuclear Production JGH/LJM/rw Attachment cc:
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E. E.
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A. C.
De Michele Van Brunt Jr.
Licitra Zimmerman Gehr
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ATTAQRENT l CPC Software Al orithm Chan es Modification of Temperature Shadowing Factor Algorithm Modification of the CPC Power Bias Algorithm Improvement to UPDATE Algorithm Modification of Heat Flux Distribution Extrapolation in STATIC Modification of DNBR Penalty for ASGT in UPDATE CPC Executive Pro ram Chan es Correct the continuous auto-restart problem during periodic testing when the test cart terminal is not connected.
Correct the error codes and messages for parity error, power failure and auto-restart.
Reverse the control element assembly (CEA) position isolation ampli-fier (CPIA) test enable light on/off sequence to be consistent with the test cart.
Correct the round-off error in displaying floating point numbers on the operator module.
Remove plant monitoring system (PMS) data from the CPC algorithm memory scratch storage.
Remove unused CEAs from the CPC-PMS data link transmission.
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