ML20059H816
| ML20059H816 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 11/04/1993 |
| From: | Simpkin T COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| IEB-90-001, IEB-90-1, NUDOCS 9311100228 | |
| Download: ML20059H816 (3) | |
Text
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[>%) Commonwrith Edison 1400 Opus Place
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Downers Grove.1llinois 60515 N
November 4,1993 Dr. Thomas E. Murley, Director
' Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555 Attention: Document Control Desk
Subject:
Supplemental Response to NRC Bulletin 90-01 Supplement 1 Zion Station Units 1 and 2, NRC Dockets 50-295 and 50-304 l
Reference:
(a) NRC Bulletin 90-01 Supplement 1, " Loss of Fill Oil in Transmitters Manufactured by Rosemount," dated December 22,1992.
(b) March 5,1993 letter from D. Chrzanowski to Dr. T. Murley
Dear Dr. Murley:
The Reference (a) bulletin requested additional actions of licensees utilizing Rosemount pressure transmitters. Reference (b) provided Commonwealth Edhon Company's (CECO) response to the Reference (a) transmittal.
in a conference call held with members of your staff on September 15,1993, additional clarifications were provided. The purpose of this letter is to_ document those clarifications in support of the NRC staff's review of CECO's actions with regard to 1.E.
3 Bulletin 90-01 and its supplement. These clarifications are provided in the attachment to this letter, if there are any questions or comments, please contact this office.
Sincerely,
%xM T.W. Simpkin -
Nuclear Licensing Administrator j
l Attachment cc:
J.B. Martin, Regional Administrator-Rill C. Shiraki, Zion Project Manager-NRR/PDill-2 l
J.D. Smith, Senior Resident inspector-Zion k
931110C228 931104 O
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L ATTACHMENT l
The following inquiries were telephonically transmitted to CECO on September'15, 1993. The inquiries and CECO responses are detailed below:
- 1. The information contained in paragraph 1.a of Attachment 1 of CECO's 3/5/93 response to IEB 90-01, Supplement 1 appears to be inconsistent with the information presented in of the same response.
RESPONSE: The noted inconsistency appears to be the frequency.of the enhanced surveillance. Attachment 2 lists transmitter categories as stated in the bulletin supplement,.
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including the bulletin's frequency of the enhanced surveillance, and only provides Zion Station's distribution of transmitters in these categories. Attachment 1. lists the actions Zion l
Station intends to take relative to the transmitters in each category. The single non-mature i
transmitter in Bulletin Category 1.a will be replaced prior to restart from the dual unit outage.
j currently underway.
- 2. The information included in paragraph 1.b of Attachment 1 to the 3/5/93 response 4
appears to be inconsistent with Attachment 2 of the same transmittal.
RESPONSE: The noted inconsistency appears to be the surveillance frequency noted in CECO's response, as compared to the frequency indicated in the bulletin supplement. lists the transmitter categories as presented in the bulletin supplement, including the bulletin's frequency of the enhanced surveillance, and only provides the distribution of Zion station's transmitters in these categories. The single non-mature transmitter in Bulletin Category 1.b will be replaced prior to restart from the dual unit outage currently underway.
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- 3. The justification contained in Attachment 3 for extending the enhanced surveillance frequency for Bulletin Category 1.a and 1.b transmitter does not specify what constitutes
- i acceptable performance.
RESPONSE: Acceptable performance is characterized as a transmitter NOT exhibiting either or both of the following symptoms:
- sustained zero drift beyond the limits 3stablished in Rosemount Technical Bulletin #4
- sluggish response during calibration j
- 4. Provide the psi-month values for the seven transmitters included in Attachment 1, paragraph 1.f of the 3/5/93 response.
RESPONSE: 1FT-FWO2 approx. 2500 psi-month 1FT-FWO4 approx. 2500 psi-month 1FT-FW25 approx. 2100 psi-month j
2FT-FWO2 approx. 2800 psi-month 2FT-FWO3 approx. 2800 psi-month 2FT-FW25 approx. 2800 psi-month a
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Si Confirm that the enhanced surveillance program discussed in 'the 3/5/93 response is:
consistent with Rosemount Technical Bulletin #4.
RESPONSE: The enhanced surveillance program which' was outlined in' CECO's response to the original bulletin dated 7/20/90 conforms to Rosemount Technical Bulletin #4. The major features of the program are:
licensed Operating and Instrument Maintenance personnel were provided with information on the loss of fill oil issue.
Rosemount transmitters related to the bulletin are trended for zero drift.
transmitter calibration packages include information to inform Instrument Maintenance personnel of the sluggish response exhibited when a loss of fill oil.
i condition occurs.
j The zero drift trending is based on Rosemount Technical Bulletin #4.
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