ML20212J891
| ML20212J891 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 01/19/1987 |
| From: | Mcnutt G, Russell J TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20212J703 | List: |
| References | |
| 229.10(B), 229.10(B)-R, 229.10(B)-R00, NUDOCS 8701280353 | |
| Download: ML20212J891 (4) | |
Text
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TVA EMPLOYEE CONCERNS REPORT NUMBER: 229.10(B)
SPECIAL PROGRAM REPORT TYPE:
SEQUOYAH ELEMENT REVISION NUMBER: 0 NON-RESTART JUSTIFICATION
SUMMARY
TITLE:
MERCURY SWITCHES IN DIESEL GENERATCR BUILDING PAGE 1 0F 2 REASON FOR REVISION:
PREPARATION PREPARED BY:
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//'2f-FI SRP OL l~l9'87 SIGNATURE DATE SIGNATURE
- DATE APPROVED BY; l*$0*b ?
N/A ECSP MA4AGER DATE MANAGER OF NUCLEAR POWER DATE
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CONCURRENCE (FINAL REPORT ONLY) s
- SRP Secretary's signature denotes SRP concurrences are in files.
11/12/86 - 0451D B701280353 B70120 PDR ADOCK 05000327 P
SEQUOYAH NUCLEAR PLAN 1 ENGINEERING RELATED EMPLOYEE CONCERNS f'
SPECIAL PROGRAM NON-RESTART JUSTIFICATION
SUMMARY
SUBCATEGORY / ELEMENT 229.10181 While the use of mercury in dif ferent applications (e.g., mercury vapor lamps) inside containments or in areas of possible contact with austinetic stainless steel in primary loops and safety systems have been limited, there is no absolute prohibition against the proper application of mercury contact switches in land based nuclear reactor projects.
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Proper application of mercury switches to uses where their inherent advantages offset their limitations is permitted.
Design guidance outlining these parameterc is in place. As stated in the concern, corrective actions, where use of such devices is presumably not in accordance with such design guidance, have been taken at SQN.
ATTACHMENT:
List of Issues for Mechan _ical ELEMENT NO.
229.10(B)
Date:
11/08/86
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04510 - Page 2
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LIST OF MECHANICAL ISSUES SQN RESTART -
ELEMENT NUMBER 229.10 BY:
D. L. Damon Date: 11/08/86 ELEMENT WHERE RESPON-CONCERN NUMBER (S)
ISSUES ADDRESSED SIBLE GENERAL APPROACH / METHODOLOGY FOR ELEMENT REPORT BSP-QCP-10.35-18 1.
Use of mercury switches in Diesel DLD 1.
Review Instrument Listing of Diesel Generator!
(System 82) and systems related to it (e.g.,
Mes cury Switches in Diesel Generator Building.
Fuel Oil, Component Coaling, etc.) to establis Generator Butiding.
all potential mercury containing switches Not concerned with mercury contained in the Diesel Generator Butiding.
contwninstion. Ininks mercury switches are not 2.
Physically walkdown the Diesel Generator supposed to be used on Building to verify the actual type, make and nuclear plants. Taken out model number Of all sensing switches located i i
i at SON and replaced witn the Diesel Generator Building.
other switcnes.
3.
Review TVA Design Guides and any NRC question?
relating to the acceptable applications of Mercury containing switches.
4.
Review SON documentation relating to the removal of mercury containing switches.
s 5.
Establish validity of ccncern and present disposition of the issue.
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118 REFERENCE
- ECPS128J-ECPS121C TENNESSEE VALLEY AUTHORITY PAGE IIS FREQUENCY
- REQUEST OFFICE OF NUCLEAR P0HER RUN TIME - 12:57:19 q
DNP - ISSS - Rm EMPLOYEE CDNCERN PROGRAM SYSTEM (ECPS)
RUN DATE - 12/02/86 LIST OF EMPLOYEE CONCERN INFORMATION CATEGORY: EN DES PROCESS & OUTPUT SUBCATEGORY: 22910 USE OF MERCURY SMITCHES
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S GENERIC KEYNORD A H
APPL QTC/MSRS P
KEYNORD B CONCERN SUB R PLT 5BSH INVESTIGATION S
CONCERN KEYNORD C NUMBER CAT CAT D LOC FL45 REPORT R
DESCRIPTION KEYNORD D
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BNPOCP10.35-18 EN 22910 N BLN YYYY SR CI THINKS MERCURY SNITCHES AREN'T SU REPORT PPOSED TO BE USED IN NUCLEAR PLANTS.
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1 CONCERNS FOR CATEGORY EN SUBCATEGORY 22910 7
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