ML17299A817
| ML17299A817 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 11/29/1985 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| ANPP-34127-EEVB, TAC-61875, NUDOCS 8512030552 | |
| Download: ML17299A817 (10) | |
Text
REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)'CCESSION NBR:B512030552 DOC~DATEe 85/11/29 NOTARIZED:
NO DOCKET FACIL:STN 50"529 Palo Verde Nuclear Stat ioni* Unit 2i Arizona>> Publi 05000529 AUTH,NAME AUTHOR AFFILIIATION VAN BRUNTiK.K,'rizona Nuclear Power ProJect (formerly Arizona Public Serv REC IP. NAME REC'IP I ENT AFFILIATION KNIGHTON~G,I>>I, PHR Project Dir ectorate 7
SUBJECT:
Responds toI 851127 request for addi commitments to ensure charging pump operability. Capability to. vent hydrogen from.
charging pumps willibe completed prior to>> facil-ity exceeding 5/ power,.
DISTRIBUTION CODE:
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TITLE: Licensing Submittal:
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PHOENIX, ARIZONA85072-2034 November 29, '1985 ANPP-34127=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:
(1)
Telecon between the NRC Staff (G.
W. Knighton, A. E. Licitra and M. Ley) and ANPP (T. F.
Quan) on November 27, 1985.
(2)
Letter from E.
E.
Van Brunt, Jr.,
ANPP, to D.
F. Kirsch, NRC Region V, dated November 28, 1984 (ANPP-31264)
Subject:
Dear Mr. Knighton:
During the reference (1)
- telecon, you requested that ANPP make additional commitments to ensure charging pump operability.
Our understanding of this request and the ANPP response is provided in the attached.
Please contact Mr. W. F. Quinn of my staff if you have any questions.
Very truly yours, 8512030552 851129 PDR ADOCK 0500052'7 A
PDR E. E.
Van Brunt, Jr.
Executive Vice President Project Director EEVB/TFQ/dk Attachment cc:
R. P.
Zimmerman E. A. Licitra M.
Ley A. C. Gehr
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Attachment to ANPP 34127 ATTACHMENT NRC RE VEST FOR INFORMATION A.
Prior to exceeding 5X
- power, demonstrate the capability to vent hydrogen from the charging pumps to allow use of a gravity feed line for suction.
(Note:
a less hazardous gas such as Nitrogen or Carbon Dioxide may be used in the demonstration).
B.
Change the commitment, as stated in reference (2), for inspection of the charging pumps from once per month (up to 3000 hours0.0347 days <br />0.833 hours <br />0.00496 weeks <br />0.00114 months <br /> of operation) to once per week.
This once per week inspection should include an inspection of the pumps for indications of leakage or weeping through the pump casing.
C.
D.
Declare a charging pump inoperable, if indications of a pump casing crack (bor'on crystallization or weeping) are observed.
I Prior to exceeding 5X'ower, perform a Non-Destructive Examination (NDE) of the Unit 2 Charging Pumps to collect baseline data.
E.
Prior to the'nd of the first refueling outage, evaluate the affect of gas binding an operating charging
- pump, which has a preexisting casing crack.
Will this postulated operating condition lead to a
failure of the pump to deliver the required flowP
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Attachment
.AifPP 34127 to ATTACHMENT ANPP RESPONSE'.
ANPP will demonstrate the capability to vent hydrogen from the charging pumps.
This demonstration will be completed prior to Unit 2 exceeding 5X power.
B.
Deficiency Evaluation Report (DER) 84-44, transmitted by reference (2),
committed to an inspection program to observe the charging pumps for indications of leakage or weeping.
Inspections would take place on a monthly basis, until the pumps accummulated 3000 hours0.0347 days <br />0.833 hours <br />0.00496 weeks <br />0.00114 months <br /> of operation, at which time the inspection frequency would be changed to a
weekly basis.
These inspection frequencies are based on industry experience with Gaulin charging pumps, which shows that the pumps have several thousand hours of operating time prior to cracking.
The NRC Staff's request of changing the inspection frequency to weekly, for accummulated operating time of less than 3000
- hours, appears to be very conservative given the industry experience.
Since the PVNGS charging pumps are expected to accumulate 3000 hours0.0347 days <br />0.833 hours <br />0.00496 weeks <br />0.00114 months <br /> of operating time, within several months after fuel load, ANPP will conduct a weekly charging pump inspection beginning just prior to Unit 2 initial fuel load.
C.
DER 84-44 stated that based on industry experiences a
cracked charging pump block does not cause a
pump to fail to operate or fail to deliver the required flow.
Industry experiences of leakage through a
cracked block has been estimated to be less than two gallons per hour, which is not sufficient to affect the operability of the charging pump as defined by the technical specifications.
We do not believe it is necessary to declare a
charging pump inoperable based solely on indications of a
cracked block.
If a crack more severe than that postulated in DER 84-44 were to occur, the charging pump would probably be declared inoperable based on its inability to deliver the required flow.
Therefore, we believe the current charging pump operability criterion (i.e., flow) is adequate.
D.
DER 84-44 stated that based on industry experience, it is believed that charging pump block cracks originate from material inclussions located at or near the surface at the intersection(s) of bores (high stress area) and propagate due to internal cyclic work pressure and piping vibration loads.
These loads are decreased via the use of suction stabilizers and discharge pulsation dampeners.
The PVNGS piping design incorporates the use of suction stabilizers and discharge pulsation dampeners.
Based on the PVNGS charging system piping design, the implementation of a weekly inspection of the charging
- pumps, and the lack of safety significance of a crack in a
charging pump block (as stated in DER 84-44), it is our position that is is not necessary to perform an NDE of the charging pumps'
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Attachment to ANPP 34127 ATTACHMENT ANPP RESPONSE (Cont'd)
E.
ANPP will evaluate the affect of gas binding of an operating
- pump, which has a preexisting block crack.
Specifically, if possible, we will determine if this postulated condition will lead to a failure of the pump to deliver the required flow.
This evaluation will be completed prior to the end of the first refueling outage of PVNGS Unit 2.
References:
(1)
Telecon between the NRC staff (G.
W. Knighton, E. A. Licitra and M.
Ley) and ANPP (T. F. Juan) on November 27, 1985.
(2)
Letter from E.
E.
Van Brunt, Jr, ANPP, to D.
F. Kirsch, NRC Region V,
dated November 28, 1984 (ANPP-31264).
Subject:
Deficiency Evaluation Report 84-44.
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