ML20204E330
| ML20204E330 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 07/02/1980 |
| From: | Warembourg D PUBLIC SERVICE CO. OF COLORADO |
| To: | John Miller Office of Nuclear Reactor Regulation |
| References | |
| P-80201, TAC-65992, NUDOCS 8009220318 | |
| Download: ML20204E330 (2) | |
Text
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's pWire g",vice Company @ WCM d
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I 16806 ROAD It"4
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PLATTEVILLE, COLORADO 80651 July 2, 1980 O
n F-80201
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Mr. JLs Hiller k
Chief. Special Projects Branch
.k U. S. Nuclear Regulatory Commission M
Vashington, D.C.
20555 i
SUBJECT:
Fort St. Vrain Unit No. i GV Helitan Circulator Inspec-tion
)
Dear Mr. M111ert In accordance with the Fort St. Vrain Technical Specifications SR 5.2.17 and SR 5.2.18, helium circulator serial number C-2102 was re-moved from service and inspected during our last refueling outage.
The objective of this inspection effort was threefold.
1 1.
To determine if there was any abnomal wear or degradation of cocponents and to confirm the integrity of the helium circulator pelton wheels given the problems experienced with cavitation and cracking of the pr9vious pelton wheel l
design.
2.
]
Based on the findings of the inspection determine a program s
and schedule for future helium circulator inspections.
3.
Based on the findings of items 1 and 2 above submit a re-port to the Nuclear Regulatory staff for reviev vith recom-eendations for a continuing program of helium circulater inspections.
With reference to the first of these three objectives we are trans-mitting herewith three (3) copies of General Atomic Co=pa!y's report CA-C158f.7 which provides the results of the helites circu'ator inspec-tion.
There were no unusual signs of abnormal wear or c sponent deg-radation.
Inspection of the pelton wheels revealed no evi.*:nce of destructive cavitation or curvic coupling cracking. In general, the
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inspection did not reveal any major areas of concern.
j l
l' Mr. Jim Hiller July 2. 1980 With reference to the second and third objectives we have evaluated the results of the inspection and based on these results we have reached the following conclusions with reference to an ongoing inspec-tion program.
I 1.
SR 5.2.17. Heliu:n Circulator Pelton Wheels, should be deleted and combined with SR 5.2.18. Helium Circulators. The pelton wheels can be inspected as a part of the overall helium circu-later surveillance program. Based on the findings of the pelton wheel inspection there is no need to establish a separata inspection program or different time frame of pelton wheel inspec-tien versus overall helium circulator surveillance.
2.
Based on the results of the inspection and the performance of the heliu:n circulators it is felt that an inspection frequency of 15 years could be justified in lieu of the 10 years presently specified. Given the importance of helium circulators, ho~ever.
ve vould propose to conduce the next inspection on a 10 year cycle. Ve vill ut111:e the results of this next 10 yest inspec-tion to re-establish, as may be dictated by the inspection results, the next inspection cycle.
3.
Ve ve.14 propose to continun volumetric, surface, and subsurface examir.ation for the turbine whe=2. Delton wheel, and compressor rotor for the next inspection cycle 31tbough it would appear that visual examination would be adequate. As indicated in item 2 above ve vill re-evaluate the results of the next 10 year inspection to establish the need and extent of volumetric, surface.
and subsurface txamination.
l The abcve reco== ended program is essentially described in the proposed draft revisions to the Fort St. Vrain Technical Specificatier.s transmitted to you on v. arch 31. 1990 (P-80064). As indicated in P-80064. Public Service Company requests Nuclear Regulatory Co -sission review of the proposed in-service in-i spection prestam.
Very truly yours.
1 Don W. 'larembourt I
Manager. Nuclear Production Tort St. Vrain Ntelear i
Cenerating Stattun N?.'/ a lk i
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