NRC-93-0146, Forwards Response to NRC Questions Re Suppl 1 to NRC Bulletin 90-001, Loss of Fill Oil in Transmitters Mfg by Rosemount
| ML20059A477 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 12/20/1993 |
| From: | Gipson D DETROIT EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-93-0146, CON-NRC-93-146 IEB-90-001, IEB-90-1, NUDOCS 9312300217 | |
| Download: ML20059A477 (4) | |
Text
Douglas R G4 son 9...,9r W e Premar#
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December 20, 1993 NRC-93-0146 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C.
20555
References:
- 1) Fermi 2 NRC Docket No. 50-341 NRC License No. NPF-43
- 2) NRC Bulletin 90-01, supplement 1, " Loss of Fill Oil in Transmitters Manufactured by Rosemount", dated January 4, 1993
- 3) Detroit Edison Letter to NRC, " Detroit Edison Response to NRC Bulletin 90-01",
Supplement 1, NRC-93-0037, dated March 5, 1993
Subject:
Formal Response to NRC Questions on Detroit Edison's Response to Bulletin 90-01, Supplement 1 The purpose of this letter is to provide a formal response to the NRC questions regarding Referenct 3 Detroit Edison previously responded to these questions satisfactorily via facsimile. Mr. Tim Colburn, the NRR Project Manager for Fermi 2 requested Detroit Edison to document the answers in a formal response to the NRC. This letter satisfies the above NRC request. The NRC questions and Detroit Edison's response is provided in the Enclosure to this letter.
If you have any questions, please contact Mr. Girija S. Shukla at (313) 586-4270.
Sincerely, W
y'~y A
Enclosure cc:
T. G. Colburn W. J. Kropp J. B. Martin M. P. Phillips h
~'512300217 931220 9
PDR ADOCK 05000341 I
G PDR
k l
USNRC Decmeber 20, 1993 i
NRC-93-0146 Page 2 i
bec:
P. Fessler D. R. Gipson L. S. Goodman L. K. Layton R. McKeon W. E. Miller. Ja.
R. A. Newkirk D. P. Ockerman R. B. Stafford W. M. Tucker J. G. Walker Information Management (140 NOC)
Secretary's Office (2412 WCB)
D. R. Hahn (Michigan Dept./Public Health)
NSRG Secretary /ISEG Coordinator (230 AIB)
UFSAR Coordinator NRR Chron File Routing Copy G. Hoscila 4
Enclosure to NRc-93-0146 Page 1 DETROIT EDISON'S RESPONSE *IT) NRC QUESTIONS ON RESPONSE 1T)
BULLETIN 90-01, SUPPLEMENT 1 o
NRC Questions:
Fermi's submittal is currently under review, and there are two areas of concern that need to be addressed so that the contractor can continue with the review.
1.
Itegarding transmitter P34N007 and transmitter G51N402, which re indicated on page 4 as being manufactured before July it, 1989:
What is the system function and system operating pressure for these transmitters?
W.ll replacement be done or will an enhanced surveillance i.onitoring program for these transmitters be done?
2.
The licensee determined that 18 transmitters are outside the scope of an enhanced surveillance monitoring program based on the normal operating pressure being zero.
What is the normal system operating pressure?
Based on that pressure, is replacement or an enhanced survellance monitoring program needed for those transmitters?
o Detroit Edison Response:
1.
Transmitter P34N007 is used to measure post accident sampling liquid return flow. Transmitter G51N402 is used to measure Torus water level. Their static operating pressures are 1100 psi and 0 psi respectively.
These transmitters will not be replaced nor will enhanced surveillance be implemented as a result of NRC Bulletin 90-01, Supplement 1 because they are exempt from the scope of this supplement. P34N007 is not used for RPS, ESF actuation or ATWS applications and G51N402 is a Model 1153 Series "A" transmitter.
2.
The normal pressure on the other 18 transmitters in question is.ero.
When the systems are functionally tested, or 1
required to perform their safety functions, their pressures are as follows:
Enclosure to NRC-93-0146 Page 2 PIS No.
Model PRESSURE E11N015A 1153DB6RC 300 E11N015B 1153DB6RC 300 E11N055A 1153GB8RC 330 E11N055B 1153GB8BC 330 E11N055C 1153GB8RC 330 E11N055D 1153GB8HC 330 E11N056A 1153GB8RC 330 E11N056B 1153GB8RC 330 E11N056C 1153GB8RC 330 E11N056D 1153GB8BC 330 E21N055A 1153GB8RC 275 E21N055B 1153GB8RC 275 E21N062A 1153GB8RC 275 E21N062B 1153GB8HC 275 E41N055A 1153GB6RC 65 E41N055B 1153GB6RC 65 E41N055C 1153GB6RC 65 E41N055D 1153GB6RC 65 Supplement 1 to NRC Bulletin 90-01 states that the licensee may exclude from replacement or enhanced surveillance any transmitters that have a normal operating pressure less than or equal to 500 psi. Fermi 2 has chosen to exclude these transmitters for the following reasons:
o Transmitters in low pressure applications have an
" acceptably low" failure rate of less than 5 x 10-7 failures /hr.
o These transmitters have limited time at pressure (generally during functional testing only) and therefore have Inw accumulated psi-months of seivice. From Rosemount Report D8900115 Revision A, if the product of pressure and time in-service is lec than 12,000 psi-months for range codes 6 through 10, then they haven't had time to lose a critical volume of oil.
o These transmitters had been placed on a calibration trending program in response to NRC Bulletin 90-01, and there has been no trend on any of these transmitters that indicates oil loss.
o Functional testing and calibration of these transmitters will continue to be performed.
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