ML20204E722
| ML20204E722 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 10/14/1988 |
| From: | Tiernan J BALTIMORE GAS & ELECTRIC CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8810210437 | |
| Download: ML20204E722 (3) | |
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B Al.TIMORE GAS AND ELECTRIC CHARLES CENTER R O. BOX 1475
- BALTIMORE MARYLAND 21203 JOSEPH A.TIERNAN vecc Paasica t Nycktan Eistrov October 14, 1988 U. S. Nucleai Regulatory Commission Washington, DC 20555 i
ATTENTION:
Document Control Desk i
SUBJECT:
Calvert Cliffs Nuclear Power Plant Unit Nos.1 & 2; Docket Nos. 50-317 & 50-318 Reauest for Relief from ASME Code Section XI Reauirements
REFERENCES:
(a) NRC Staff Guidance for Preparing Pump and Valve Testing Program Descriptions and Associated Relief Requests Pursuant to 10 CFR 50.55a(g), dated January 1978 (b) ASME Code Section XI,1983 Edition with Addends through Summer i
1983 Article IWP-4520(b)
(c) ASME Code Section XI,1977 Edition with Addends through Summer 1978. Article IWP-4520(b)
(d) ASME Code Section XI,1974 Edition with Addenda through Summer 1975 Article IWP-4520(c)
I Gentlemen:
In accordance with 10 CFR 50.55a(gX5Xiii), we are requesting relief from an ASME Code Section XI inservice testing requirement. The information concerning this relief request is presented herein as detailed by Reference (a).
l Application of ASME Code Section XI Article IWP-4520(b) to the Reactor Coolant Charging Pumps at Calvert Cliffs Units I and 2 is impractical. We request relief from the 4
requirements of Article IWP-4520(b) for the Reactor Coolant Charging Pumps Nos. II,12, 13, 21, 22, and 23. We shall continue to perform alternate testing as we have in the past.
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. Docum:nt Control Desk October 14, 1988 Page 2 1
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Comaanents for Which Relief is Rannanted Relief is requested for the frequency response range of the instruments used to measure the vibration amplitude of the Reactor Coolant Charging Pump: 11, 12,
'), 21, 22, and 23. The charging pumps are positive displacement pumps which l
cake suction from the voiume control tank to add makeup coolant to the Reactor Coolant System. The charging pumps are ASME Section til Code Class 2.
II.
ASME Recuiremments from Which Relief is Reauested Relief is requested from ASME Code Section XI Article IWP-4520(b) (IWP-4520(c) in the 1974 Edition) for the following inservice testing intervals:
1.
The first 10-year inservice testing interval for Unit I w hich fell under the 1974 Edition with Addenda through Summer 1975, and; 2.
The first 10-year inservice testing interval for Unit 2 which fell under the 1977 Edition with Addenda through Summer 1978, and; 3.
The current and all future 10-year inservice testing intervals which fall under the 1983 Edition with Addenda through Summer 1983.
ASME Code Section XI, Article IWP-4520(b) requires that the frequency response range of instruments used to measure vibration amplitude shall be from one-half miniraum sh::d to a least masimum pump shaft rotational speed.
Ill.
Basis for Relief Engineering review of the testing requirements has shown that instrumentation is not currently available which will measure the required frequency response range for the charging pumps. The charging pump shaft rotational speed is l
209 rpm. One-half rotational speed is 104.5 rpm, or 1.74 liz. We know of no vibration instrumentation which measures accurately at frequencies this low.
Therefore, Article IWP-4520(b) is impractiest for the charging pumps.
The requirement to measure the frequency response range at one-half to full maulmum pump rotational speed is based upon detecting oil whip or oil whirl in a journal bearing. The charging pumps vibration readings are taken from an oil mist-lubricated rolling-clemer.t bearing.
This type of oil-mist-lubricated rolling clement bearing is not susceptible to the oil whip or whirl phenom' na as are journal bearings. Therefore, application of this requirement in this particular circumstance would not serse the underlying purpose of the requirement.
O Docume:t C ntrol Desk October 14, 1988 Page 3 IV Alternative Testina it is proposed that the instrumentation, which has been used in the past to measure charging pump vibration, continue to be used in the future. Current instrumentation reads accurately from 3 llz to 10,000 liz, which is an adequate range to indicate pump mechanient condition.
Furthermore, these pumps are part of the Calvert Cliffs Rotating hiachinery Vibration hionitoring Program. As such, they are monitored monthly under program requirements which surpass the requirements of Section XI for determining pump mechanical condition. The Calvert Cliffs program samples vibration characteristics at thirteen locations on the pump, including the location required by IWP-4510. Even though the Rotating hiachinery Vibration hionitoring Program does not satisfy the one-half rotational speed criterion, the program samples over a response range to 10 times the pump shaft rotational speed, obtaining an overall reading as well as a spectrum measurement. The program also measures high frequency vibration (above 5000 lir) which has been successfully used to detect roller bearing degradation below the Section XI action ranges for overall vibration.
FEE DETERMINATION Pursuant to 10 CFR 170.21, we are including DG&E Check No. 1270939 in the amount of
$150.00 to the NRC to cover the application fee for this request.
Should you have eny further questions regarding this request, we will be pleased to discuss them with you.
Very truly yours,
/ahw JAT/htDD/CDS/ dim Attachment ec:
D. A. Ilrune, Esquire J. E, Si! berg, Esquire R. A.Capra, NRC S.
A. NicNeii, NRC W. T. Russell, NRC D. C. Trimble/V. L, Pritchett, NRC T. hiagette, DNR