ML20077D206
| ML20077D206 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 05/17/1991 |
| From: | Feigenbaum T PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NYN-91081, NUDOCS 9105280145 | |
| Download: ML20077D206 (4) | |
Text
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New Hampshire Yankee fed C. Feigenbaum Chief Executwe Ofhcer N Y N-910S 1 May 17,1991 United States Nuclear Regulatory Commission Washington, D.C.
20555 Attention:
Document Control Desk
References:
(a)
Facility Operating License No. NPF 86, Docket No. 50-443 (b)
N U R E O-0896, Supplement No.
6, October 1986, " Safety Evaluation Report related to the operation of Seabrook Station, Units 1 and 2."
Subject:
Inservice Testing Program Gentlemen:
Pursuant to 10CFR50.55a(g)(5) and the Seabrook Station Safety Evaluation Report, Supplement 6, Appendix S, New llampshire Yankee (NHY) hereby submits a proposed change to the NHY Inservice Testing Program, provided as Enclosure 1.
Inservice Testing Program Relief Request P 5 addresses the use of digital instruments in place of analog instruments to perform pump vibration readings. The current inservice Testing (IST) Program requirements for instrument ranges are specified in ASME Section XI, Article 4000, Methods of Measurement, Paragraph 4120, Range, which states: "The full-scale range of each instrument shall be three times the reference value or less." This requirement is established with co'isideration of analog instruments which have a percent of accuracy based upon the full scale raige.
The range to be utilized is limited to minimize the uncertainties introduced when ma,.ing a measurement.
NilY desires to enhance the existing Inservice Testing Program and utilize our digital instruments in place of analog instruments to perform the vibration measurements on all pamps. Digital instruments have a known accuracy that is based upon the actual reading being taken and not the scale utilized. Therefore, utilizing a digital instrument will provide a more accurate reading than an analog instrument. The distal instruments are easier to use, less likely to be misread and produce more consistent readings than the analog instruments. NilY is planning to use a Vitec Incorporated, Model 653 CS, Vibration Meter and Bearing Tester which has accuracy of i SE The use of digital instruments has been approved by the American Society of Mechanical Engineers (ASME) in ASME/ ANSI OMa-1988 Addenda to ASME/ ANSI OM-1987, Operation and Maintenance of Nuclear Power Plants. OM-1988 specifically states in Paragraph 4612:
9105280145 910517
.I PDR ADOCK 0500044?
P PDR New Hampsrure Yonkee Division of Public Service Company of New Hampshire
$i~
P.O. Box 300
- Seabrook, NH 03874
- Telephone (603) 474 9521
)
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l United States Nuclear Regulatory Commission hiay 17,1991 Attention:
Document Control Desk Page two
" Range:
a)
The full scale range of each analog instrument shall b,
, t greater than three time the reference value.
b)
Digital instruments shall be selected such that the reference value shall not exceed 70% of the calibrated range of the instrument.
c)
Vibration instruments are excluded from the range requirements of a & b above."
The NRC has endorsed the use of ASME/ ANSI OM 1987 in the proposed revision to 10CFR55.55a that was published in the Federal Register on January 31, 1991.
Inservice Testing Program Relief Request P 5 requests that digital vibration instruments be excluded from the range requirements of ASME Section XI, Paragraph IWP-4120. Relief Request P.5 should be incorporated into Section 6.2, Relief Requests Pumps, of the NHY Inservice Testing Program. New Hampshire Yankee believes that the proposed revision to the Inservice Testing Program will provide an enhancement to the program and respectfully requests your review and approval of this Relief Request by July 15, 1991.
Should you have any questions regarding this matter please contact Mr. James M. Peschel, Regulatory Compliance Manager, at (603) 474-9521 extension 3772.
Very truly yours, sh/Q/ 4' d4 Ted C. Feige. aum Enclosure TCF:J M P/ssi
=
cc:
Mr. Thomas T. Martin Regional Administrator United States Nuclear Regulatory Commission Region 1 475 Allendale Road King of Prussia, PA 19406 Mr. Gordon E. Edison, Sr. Project Manager Project Directorate 13 Division of Reactor Projects U.S. Nuclear Regulatory Commission Washington, DC 20555 l
Mr. Noel Dudley NRC Senior Resident inspector t
P.O. Box 1149 Seabrook, NH 03874
New flampshire Yankee May 17,1991 ENCL.OSURE 1 TO NYN 910R1
l Relief lleauest:
P5 Specific relief is being requested to exclude digital vibration instruments from the requirements of Paragraph IWP-4120 that the full scale range of test instrumentation be not greater than three times the reference value.
P u mris:
All Code Class:
2 and 3 Punction:
Pumps required to perform a function in shutting down the reactor or in n,itigating the consequences of an accident, and are piovided with an emergency power source.
Test Reauirements:
IWP-4120 R ANGE, the full scale range of each instrument shull be three times the reference value or less.
Basis For Relief:
The requirement for vibration instruments to have a full scale range of three times the reference value or less is not indicative of instrument ability.
A digital vibration instrument having an accuracy of 15% of reading with no range requirements is much better than an instrument having an accuracy of 15% full scale with a range of not greater than three times the reference value.
Additionally, ASME/ ANSI OM, Part 6, inservice Testing of Pumps in Light Water Reactor Power Plants, Paragraph 4612(c) specifies that vibration instruments are excluded from range requirements.
Alternate Testine:
Digital vibration instruments having a calibrated accuracy equal to or less than 15% of Reading are excluded from the rangerequirements of IWP 120, 1
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