ML20055J293
| ML20055J293 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/23/1990 |
| From: | Jabbour K Office of Nuclear Reactor Regulation |
| To: | Tucker H DUKE POWER CO. |
| References | |
| TAC-76445, TAC-76446, NUDOCS 9008020061 | |
| Download: ML20055J293 (3) | |
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' July 23, 1990
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Docket Hos. 50-413 and 50-414'
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Mr. H..B. Tucker, Vice President Nuclear Production Department Duke Power Company g
P. O. Box 1007 Charlotte,: North Carolina 28201-1007
Dear Mr. Tucker:
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION ON GENERAL RELIEF REQUEST FOR:
PUMP VIBRATION; CATAWBA NUCLEAR STATION, UNITS 1-AND 2 (TACs76445AND76446) i By letter dated March 15, 1990, you submitted a general _ relief request for pumps in the inservice testing program at Catawba Nuclear Station, Units 1 i
and 2.
This relief-request contains a proposal ~for measuring pump vibration velocity based on OH-6 of the American Society of Mechanical Engineers. We have reviewed your submittal and find that additional information regarding certain areas that deviate from-0M-6, identified in the enclosure, is required l
to complete our review.
i Your response to.the enclosure is requested within 30 days from the date of 1
this letter.
Please contact me at (301) 492-0904 'if.you have questions.
i The reporting and/or recordkeeping requirements contained in this. letter affect fewer than ten respondents; therefore,'OMB clearence is not required:
1 under P.L.90-511.
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Sincerely, Origina1{signedby:-
Kahtan N.Wabbour,: Project Manager ;
Project D.irectorate 11.
i Division of Reactor; Projects---I/II-Office ofiHuclear Reactor Regulation
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Enclosure:
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. So cc w/ enclosure:
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r Mr. H. B. Tucker Catawba Nuclear Station Duke Power Company cC; A.V. Carr, Esq..
North Carolina Electric Membership Duke Power Company Corp.
422 South Church Street 3400 Sumner Boulevard Charlotte, North Carolina 28242-P.O. Box 27306 i
Raleigh, North Carolina 27611 J. Michael McGarry, III, Esq.
Bishop, Cook, Purcell and Re.vnolds Saluda River Electric Cooperative, 1400 L Street, N.W.
Inc.
Washington, D. C.
20005 P.O. Box 929 Laurens, South Carolina 29360 North Carolina MPA-1 Senior Resident Inspector Suite 600 Route 2, Box 179N u
3100 Smoketree Ct.
York, South Carolina 29745 P.O. Box 29513 Raleigh, North Carolina 27626-0513' Regional Administrator, Region II U.S. Nuclear Regulatory Comission Ms. S. S. Kilborn 101 Marietta Street, NW, Suite 2900 Area Manager, Mic-South Area Atlanta, Georgia '30323 ESSD Projects Westinghouse Electric Corp.
Mr. Heyward G. Shealy, Chief MNC West Tower - Bay 239 Bureau-of Radiological Health P.O. Box 355 South Citrolina Department of Health Pittsburgh, Pennsylvania 15230 and Environmental Control.
2600 Bull Street County Manager of York County Columbia, South Carolina 29201' York County Courthouse York, South Carolina 29745 Ms. Karen E. Long Assistant Attorney General i
Richard P. Wilson, Esq.
'H.C. Department of Justice Assistant Attorney General P.O. Box 629 S.C. Attorney General's Office Raleigh, North Carolina 27602 P.O. Box 11549 Columbia, South Carolina 29211 Mr. Robert G. Morgan.
Nuclear Production Department Piedmont Municipal Power Agency Duke Power Company 121 Village Drive P.O. Box 33189 Greer, South Carolina 29651 Charlotte, North Carolina 28E41 Mr. Alan R. Herdt, Chief Project Branch #3 U.S. Nuclear Regulatory Commission j
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 P
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j ENCLOSURE RE0 VEST FOR ADDITIONAL INFORMATION ON li.
l CATAWBA GENERAL PUMP RELIEF REQUEST 1.
OM-6 Section 4.6.4 Paragraph (d) states "... the: reference points must be 7
clearly identified on.the pump tc permit subsequent duplication in both location and plane." Does Catawba intend to mark the measurement locations, q
especially in the cases where there will be a deviation from OM-6 because l
i the pump bearing housings'are not accessible?
2.
OH-6 Table 1 states Acceptable. Instrument Accuracy for Vibration measurements ~
to be +/- 5%. Using the total / absolute accuracy statement of +/- 7.3%
uncertainty for the accelerometer and the data collector given in the relief request and applying it to the square root of the sum of the squares me, hod to determine the total loop accuracy gives an overall maximum occuracy of +/- 10.32%, twice the allowed.value from OM-6. While you have indicated that the proposed instrumentation is the-best that 'can i
be reasonably obtained, there is a= question whether this amount of error could mask a degraded pump or cause a good pump to be declared inoperable by stretching or compressing.the eavelope allowed. In view of the above,.
provide a basis for the proposed metrument accuracy addressing the need for the test to assess operational Madiness and detect degradation.
Also. address whether instrumentation that meets Code accuracy can be obtained at greater expense.
3.
OM-6 Table.3 shows " Acceptable", " Alert", and " Required Action" ranges based on the reference value for vibration velocity.
Catawba proposed assigning absolute vibration velocity " Alert" and " Required Action" limits reference values less than 0.075 in/sec) pumps wf th vibration velocity.
for their smoothly running pumps (those This deviation from OM-6 may not be conservative for every pump in this classification since it could:
l allow a large change in vibration velocity measurements, from the reference value, prior to reaching the assigned limits. Alternate methods such as using different absciute values of acceptance criteria or setting minimum refe-ence values should be adequately justified.
4.
0H-6 recommends measuring pump vibration displacement for low speed pumps.
(i.e.. < 600 rpm). Clarify how this relief request addresses-the OM recomendation to measure displacement for_ low speed pumps.
5.
OM-6 Section 4.6.1.6 states that the frequency response; range "...shall be from 1/3 minimum' pump shaft rotational speed to at least 1000 Hz."
Provide justification to assure that pump degradatio'niof low.s med pumps will be observed'with the proposed instrumentation. : Address t11s issuo for the low speed pumps at Catawba in tenns of J11kely degradation mechanisms.
with responses at less than RPM frequencies. Also, address whether instrumentation that meets Code accuracy can be obtained at greater expense.
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