ML17299A849
| ML17299A849 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 12/04/1985 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| ANPP-34166-EEVB, TAC-61875, NUDOCS 8512060313 | |
| Download: ML17299A849 (8) | |
Text
RECULATO INFQRNATION DISTRIBUTION.'USTEN (R IDS )
ACCESSION NBR: 85120b0313 DOC. DATE: 85/12/04 NOTARIZED:
NO DOCKET ¹ FACIL:STN-50-529 Palo Verde Nuclear Stations Unit 2. Arizona Publi 05000529 AUTH. NANE AUTHOR AFFILIATION VAN BRUNT'. E.
Arizona Nuclear Power Prospect (formerly Arizona Public Serv RECIP. NANE RECIPIENT AFFILIATION KNIGHTON> Q. W.
PllR Prospect Directorate 7
SUBJECT:
Responds to 851202 telcon request for addi info re assurance of operability oF charging pumps. NDE will be performed on charging pumps to extent practical e/o component disassemblgi utilizing appropriate technique.
DISTRIBUTION CODE:
B001D CQPIEB RECEIVED: LTR I ENCL I SIZE: 2 TITLE; Licensing Submittal:
PBAR/FSAR Amdts 8( Related Correspondence NOTES: Standardi zed plant.
05000529 RECIPIENT ID CODE/NAl'1E Pl JR-B ADTS PNR-B PD7 LA INTERNAL: ACRS 41 ELD/HDS3 lE/DEPER/EPB 3b NRR BNR ADTB NRR PWR-B ADTB NRR/DHFT/HFIB NR DIR
() FILE
/NIB EXTERNAL: 24X DNB/DBS (ANDTB)
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Arizona Nuclear Power Project P.o. BOX 52034 4
PHOENIX, ARIZONA85072-2034 December 4,
1985 ANPP 34166 EEVB/TFQ 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)
(B)
Telecon between the NRC Staff (F.J. Miraglia, G.W. Knighton) and ANPP (E.E.
Van Brunt, Jr.,
J.G.
- Haynes, W.F.
Quinn) on December 2, 1985.
Letter from E.E.
Van Brunt, Jr.,
ANPP, to G.W. Knighton,
- NRC, dated November 29, 1985 (ANPP-34127)
Subject:
Charging Pump Operability.
Dear Mr. Knighton:
During the Reference (A) telecon, NRC discussed the remaining concerns related to assurance of the operability of the PVNGS charging pumps.
Our response to those concerns are provided in the attached discussion.
Please contact Mr. W.F. Quinn, of my staff, if you have any questions.
Very truly yours, cv,~
E. E. Van Brunt, Jr.
Executive Vice President Project Director EEVB/TQ/dk Attachment peas 8
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'ocket No. STN-50-529 Charging Pump Operability ANPP-34166 Page Two cc:
R.P.
Zimmerman E.A. Licitra M.
Ley A.C. Gehr F.J. Miraglia
1 ii
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ANPP-34166 December 4, 1985 ATTACHMENT 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 thrumall'rack discovery.
This period of time will allow a thorough examination of the affected charging pump to verify a thrumall 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 t'e 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'eference (B)
(Item E
of the Attachment),
has been satisfactorily resolved with the NRC.
B.
C.
As discussed in Reference (B) we do not believe it is necessary to perform a nondestructive examination (NDE) of the charging pumps on Unit 2.
However, to collect baseline
- data, we will perform an external NDE on the 'nit 2
charging pumps to the extent practical without component disassembly, utilizing the appropriate technique.
This examination will be completed prior to Unit 2 initially exceeding 5X power.
The interim operation of the charging system requires procedures for venting of hydrogen from a charging pump(s) which has become gas bound.
This venting should not pose a
hazard to the operators performing the
- venting, nor should 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 should be considered to achieve an appropriate level of system reliability.
The long-term solution should 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 should include the schedules for procurement and installation of the selected solution.
A description of the evaluation and schedules should be submitted for staff approval by June 30, 1986.
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