ML17299A852
| ML17299A852 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 12/05/1985 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| ANPP-34174-EEVB, TAC-61875, NUDOCS 8512090195 | |
| Download: ML17299A852 (8) | |
Text
REQULAT RY INFORMATION DISTRIBUTION SYSTEN'BIDS)
ACCESSION NBR: 8512090195 DOC. DATE: 85/12/05 NOTARIZED:
NO DOCKET FACIL:STN.-50-529 Palo Vev'de Nuclear Stationi Unit 2i Av'izona Pub li 05000529 AUTH. NANE AUTHOR AFFILIATION VAN BRUNT'. E.
Av izona Nucleav Pommer Pv object (formerly Av izona Public Sev v RECIP. NANE RECIPIENT AFFILIATION KNIQHTONiQ. M.
PMR Prospect Div ectov ate 7
SUBJECT:
Forwards v evised commitments to add'v ess adl.NRC concerns re charging pump operability. Engineev'ing evaluation vill" schedules fov procurement h installation of long-tevm.
solutions.
DISTRIBUTION CODE:
B001D COPIES RECEIVED: LTR ENCL SIZE'.
TITLE: Licensing Submittal:
PSAR/FSAR Amdts 8c Related Correspondence NOTES: Standardi zed plant.
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Arizona Nuclear Power Project P.O. 8OX 52034
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PHOENIX, ARIZONA85072-2034 December 5, 1985 ANPP-34174-EEVB/MAJ 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 Unit 2 Docket No. STN-50-529 Charging Pump Operability File:
85-056-026 G.1.01.10
Reference:
(A)
Letter from E.
E.
Van Brunt, Jr.,
- ANPP, to G.
W. Knighton, NRC, dated December 4,
1985 (ANPP-34166);
Subject:
Charging Pump Operability.
(B)
Letter. from E.
E.
Van Brunt, Jr.,
- ANPP, to G.
W. Knighton, NRC, dated November 29, 1985 (ANPP-34127);
Subject:
Charging Pump Operability.
(C)
Telecon between G.
W. Knighton,
- NRC, and W.
F.
- Quinn, ANPP, dated December 5,
1985;
Subject:
Charging Pump Operability Commitments Hade in Reference (A) for PVNGS Unit 2.
Dear Mr. Knighton:
Reference (A) submitted ANPP commitments to close out the staff's Unit 2
licensing concerns related to the assurance of operability of the PVNGS Unit 2 charging pumps.
The Reference (A) commitments were subsequently discussed in the Reference (C) telecon.
Per the staff's request in the above
- telecon, we are revising the previously submitted commitments in the Reference (A) letter to address additional concerns of the staff.
This letter supercedes Reference (A).
Please contact Mr. W.F. Quinn, of my staff, if you have any questions.
Very truly yours, 8512090195 851205 PDR ADOCK 05000529.:,
A PDR EEVB/MAJ/dim Attachment E.
Van Brunt, Jr.
Executive Vice President Project Director pot (I(
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Mr. G.
W. Knighton Docket No. STN-50-529 Charging Pump Operability ANPP-34174 Page Two cc:
R. P.
Zimmerman E. A. Licitra M.:
Ley A. C. Gehr F. J. Miraglia
1 4
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ANPP-34174 December 5, 1985
'TTACHMENT A.
As discussed in Reference (B),
we do not believe it is necessary to declare a charging pump inoperable based solely on the indication of a cracked block.
However, to address the concern of the potential adverse effects of gas binding of a charging pump with a thru-wall cracked block, we will declare the charging pump inoperable within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of the apparent thru~all crack discovery.
This period of time will allow a thorough examination of the affected charging pump to verify a thru~all crack does exist or allow the restoration of an inoperable charging
- pump, if necessary, to meet the Technical Specification requirements.
If, at the end of this 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> period, the discovered crack has been confirmed to be a thru~all crack, and less than the required number of charging pumps are operable, Unit 2 will follow the action statement of Technical Specification 3.1.2.3 or 3.1.2.4, depending upon the plant mode.
This condition will be effective starting with initial criticality, and remain in effect until the evaluation of the effect of gas binding an operating charging pump which has a
pre-existing block
- crack, committed to in Reference (B)
(Item E
of the Attachment),
has been satisfactorily resolved with the NRC.
B.
As discussed in Reference (B) we do not believe it is necessary to perform a non-destructive examination (NDE) of the charging pumps on Unit 2.
- However, to collect baseline
- data, we will perform an external surface examination on the Unit 2
charging pumps utilizing the appropriate NDE technique.
This examination will be completed prior to Unit 2 initially exceeding 5X power.
C.
The interim operation of the charging system requires procedures for venting of hydrogen from a charging pump(s) which has become gas bound.
The hydrogen will not be vented into the charging pump cubicle, so that it will not pose a hazard to the operators performing the venting, nor will it result in an uncontrolled or unmonitored radioactive release.
Procedures will be submitted for staff approval and a demonstration of the venting procedure will be performed prior to Unit 2 initial criticality.
While the proposed enhancements to the VCT level indicator and outlet valve of the VCT lessen the likelihood of the charging pumps becoming gas
- bound, a long-term solution to reduce this potential hazard to the pumps will be considered to achieve an appropriate level of system reliability.
The long-term solution will be established by an engineering evaluation considering alternative hardware changes necessary to eliminate the need for venting hydrogen from the suction of the charging pumps.
The engineering evaluation will include the schedules for procurement and installation of the 'elected solution.
The evaluation and schedules for implementation will be submitted for staff approval by June 30, 1986.
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