ML20027A710
| ML20027A710 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 09/18/1981 |
| From: | Dircks W NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Bradford P NRC COMMISSION (OCM) |
| Shared Package | |
| ML20027A669 | List:
|
| References | |
| FOIA-82-426 NUDOCS 8111120669 | |
| Download: ML20027A710 (8) | |
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{9-M P y +3 Comissioner Brag" NAL 81GNED BY.
, MEMORANDUM FOR:
OGC.
THau:
FRQ11 William J. DirckE'EUWD EICml~
Executive Director for Operations
SUBJECT:
SEISMIC QUALIFICATION OF SAFETY-GRADE ELECTRICAL EQUIPMENT IN DIABLO CANYON
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e In your memorandum of September 11, 1981, you asked specific questions regarding ttle seismic qualification of safety-grade electrical equip-
-ment in the Diablo Canyon plant and a comparison of the qualificati,on level to the current criteria. Questions posed in the subject memorandum are addressed in the enclosure.
'In sumary, our finding of confomance with GDC 2 and assurance that.
the safety-grade electt ical equipment will function during and after design bases earthquakes is based on the following:
l 1.
The use of Regulatory Guide 1.100 and IEEE-344,1975 standard in the qualification of safety-grade electrical equipment at the Diablo Canyon plant. -
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2.
A thorough review of the qualification program by the NRC staff both through on-site audits and review meetings.
3.
The licensee's voluntary commitment to the installation of an auto-matic seismic scram system and the assurance of non-interference
.i between safety. and non-safety systems, and 4.
The recently completed aging review, including th'e required imple-mentation of a surveillance and replacement program.
'(Sig5ed)1. Kevi5 hell William J. Dircks Executive Director for Operations l
Enclosurev
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DISTRIBUTION As stated-g; /,
Dircks Olmstead OC3417 l
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Enclosure L
Seismic Qualification of Safei9-Related Electrical Eouipment Tor tne Diablo Canyon Plant i
Current Review Requirements Section 3.10 entitled Seismic Qualification of Category I Instru-mentation and Electrical Equipment of NUREG-75/037, " Standard Review Plan for the Review of Safety Analysis Reports for Nuclear
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I Power Plants" LWR Edition, Revision 1 provides the acceptance i
criteria and qualification requirements. Review of seismic qualif,ication should ensure (a) equipment operability, and (b) adequacy of supports. For plants for which construction permit applications were docketed on or before October 27, 1972 the basic requirements for this review are those of the IEEE-344,1971 Standard. For plants for which CP applications were docketed after October 27, 1972 the applicable standard is IEEE-344,1975 and Regu-latory Guide 1.100. For the pre-1972 plants the SRP stipulates that, (1) tests or analyses are required to confirm operability of-all
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seismic Category I electrical equipment and instrumentation during and after an earthquake of magnitudes up tp and including the safe shutdown earthquake, (2) single frequency input excitations can be-i used; however, multi-frequency excitations as delineated in the'IEEE-344, 1975 Standard should be used wnenever possible, (3) for single frequency excitation the discrete input frequencies should cover the range of 1-33 Hz, (4) the equipment should be tested in operational condition, and (5) the test motion may be applied along three ortho-gonal axes separately; however, the requi:remer.t of the IEEE-344,1975 Standard for simultaneous vertical and horizontal excitations is pre-ferred.
.The review conducted against the above cited criteria ensures that the integrity of the equipment supports is maintained and that any dynamic coupling between the support and the equipment accounts for the mass and flexibility effects during a seismic event.
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