ML20058B595
| ML20058B595 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 08/09/1993 |
| From: | Glenn J, Vanpelt H DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML20058B539 | List: |
| References | |
| MCC-1503.13-, MCC-1503.13--440, MCC-1503.13-00, MCC-1503.13-00-0440, NUDOCS 9312020132 | |
| Download: ML20058B595 (4) | |
Text
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See Attached Calculation:
l MCC-1503.13-00-0440 l
I-Form 45o77 (9 92)
Duke Power Company 10 CFR 50.59 EVALUATION (1) Station: McGuire Nuclear Station Unit (s):
1&2 (2) Evaluation for: Deletion of the Boronometer (3) FSAR sections consulted: 1.11, 3.1, 3.2.4.2, 4.2,4.3, Chapter 6, Chapter 9, Table 12-2, i
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(4) Technical specifications consulted:
3/4.1, 3/4.4.7 l
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Oyes
@No l
Will technical specification changes be required?
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- Technical specifications affected:
- Station Regulatory Compliance personnel contacted:
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Dozs the modification involve an SSC that is evaluated in the FSAR or a smaller SSC that is part of an SSC evaluated in the FSAR, and does the modification do more than replace components a Yes ONo l
with equivalent components?
l Will the modification degrade the effectiveness of an SSC important to safety in any design basis accident or event?
Oyes D No Dots the modification appear to require inclusion in the FSAR due to the installation of a new system significant to plant operation, or installation of a significant addition to an existing system?
@Yes ONo
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i USO EVALUATION NOT APPUCABLE O
l May the modification:
(
increase the probability of an accident evaluated in the SAR7 Oyes
@No t
increase the consequences of an accident evaluated in the SAR7 Oyes BNo Yes M No Create the possibility for an accident of a different type than any evaluated in the SAR7 l
Yes
@No f f increase the probability of a malfunction of equipment important to safety evaluated in the SAR7 increase the consequences nf a malfunction of equipment important to safety evaluated in the SAR7 Oyes
@No Yes
@No Create the possibility for a malfunction of a dif forent type than any evaluated in the SAR7 O
Will the modification:
Rsduce the margin of safety as defined in the basis for any technical specification?
-QYes
@No yC<
PROVIDE AN ATTACHMENT TO SUBSTANTIATE A(L YES AND NO ANSWERS i
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l FORM 101.1 REVISION 13 f
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CERTIFICATION OF ENGINEERING CALCULATION-STATION AND UNIT NUMBER McGuire Nuclear Station Units 1&2 l
TITLE OF CALCULATION USO Evaluation for Deletion of the Boronometer i
CALCULATION NUMBER MCC-1503.13-OO-0440 i
ORIGINALLY CONSISTING OF:
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THROUGH 2-
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TOTAL ATTACHMENTS None TOTAL MICROFICHE ATTACHMFNTS None-l i
TOTAL VOLUMES 1
TYPE I CAld'?.. TION / ANALYSIS YES O No 8 TYPE I REVIEW FREQUENCY l
1 ITEMS. IN ACCORDANCEWITH' l
THESE ENGINEERING CALCULATIONS COVER QA CONDITION ESTABLISHED PROCEDURES, THE QUAUTY HAS BEEN ASSURED AND 1 CERTIFY THAT THE ABOVE-CALCULATION HAS BEEN ORIGINATED, CHECKED OR APPROVED AS NOTED BELOW:
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DATE APPROVED BY
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f RECEIVED BY TECHNICAL SERVICES DIVISION DATE 5
MICROFICHE ATTACHMENT LIST:
OYES @NO SEE FORM 101.4 REV.
CALCULATION PAGES (VOU ATTACHMENTS (VOU VOLUMES ORlG CHKD AffR ISSUE DATE NO.
REVISED DELETED ADDED REVISED DELETED ADDED DELETED ADDED DATE DATE DATE g*p 1
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MCC-1503.13-00-0440 By H E Vangelt }/WJ 7,1({#
y Page 1 Aug.
6, 1993 Purpose The purpose of this evaluation is to review the removal of the Baronometer from use at McGuire Nuclear Station.
The criteria of 10CFRSO.59(a)2 will be applied to make this determination.
This evaluation is QA-1.
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Background
The Baronometer will be removed as a part of Modification MG-12096 and MG-22096.
These modifications are to upgrade the loose parts monitoring system and are related to Baronometer deletion only in that the deletion may provide space in electrical cabinets for added loose parts monitoring equipment.
The Baronometer is ~part of the Chemical and Volume Control System (NV) and may be used to advise operators of boron concentration in the Reactor Coolant System (RCS) by measufing bown concentration in the letdown flow.
The Baronometer samples letdout: coolant downstream of the Reactor Coolant Filter and returns the sample to the letdown stream in the Volume Control Tank.
The Boronometer is not required for use in meeting any Technical Specification requirements but is considered in the Duke Power response to Regulatory Guide 1.97 concerning measurement of baron concentration in the RCS.
The Reg. Guide response considers the Baronometer as the primary method of detemining baron concentration. However, the actual operation of the plant relies on periodic sampling of the RCS for measurements of soluble boron concentration during nomal operation and Post Accident Liquid Sample Panel testing during postulated accident conditions.
Therefore, the Baronometer is not normally used now and may be removed from service without affecting plant operations.
No credit is taken for use of the Baronometer in any accident analysis or accident response. It is not tied to any control circuits.
The instrumentation provides a general operational aid in decemining if additional sampling for baron concentration is warranted.. The instrument is located in a Duke class B line for pressure boundary purposes but the-Baronometer and associated electronic equipment are not safety related.
Therefore, there are no safety concerns with deletion of the Baronometer from use by the station.
USQ Evaluation The Baronometer is not used for any safety control or depended on for any safety information in the event of an accident.
Therefore, there is no increase in the probability or consequence of an accident evaluated in the SAR.
The Baronometer does not effect the operation of any system since it is used only as an advisory input for operator infomation. - Therefore, the use or non use of the instrument does not create the possibility for an accident of different type than evaluated in the SAR.
The Baronometer does not control operation of any equipment. It may be used to help operators determine if additional testing of boron concentration is warranted.
It does not affect the operation of any equipment. Therefore, the removal of the Baronometer will not increase the probability or consequence of malfunction of any equipment important to safety. For the same reason, the removal of the instrument will not create the possibility for a malfunction different than any evaluated in the SAR.
Margin of safety is related to the confidence in the fission' product barriers to function as designed.
The Baronometer is not safety related in function and has no impact on any fission product barrier.
The Baronometer is not considered in meeting any Technical Specifications.
Therefore, deletion of the Baronometer will not reduce the margin of safety as defined in the basis for the Technical Specifications.
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I MCC-1503.13-00-0440 By H E Vanpe1t//[d 4 ; gyp
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y Page 2 Aug.
6, 1993 Conclusions
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No unreviewed safety questions are created by deletion of the Baronometer. No changes to Technical specifications are required.
Use of the Baronometer as an information source is mentioned in the design basis documentation for the NV system and as a possible post accident source of infonnation in the SAR, These references must be revised to reflect deletion of the Baronometer.
References 1
McGuire FSAR section 1.11, Appendix 1 Table 6, Appendix 12 Table 12.2 effective May 1, 1992.
2 McGuire SAR section 3.2.2 dated October 19, 1992.
3 NCS-1554.NV 0001 dated August 15, 1991.
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HC-1554-2.0 rev. 17 Flow Diagram for the NV system.
5 I.oetter from H B Tucker to USNRC dated October 23, 1990 on deletion of the Baronometer as a Reg. Guide 1.97 commitment for Catawba Nuclear Sta tion.
6 CNC-1503.13-00-0265 " Safety Evaluation for PIR 0-C89-0370, Non-Use of the Baron Concentration Measurement System.
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McGuire Technical Specifications as amended through amendments 132 and 114 for Unit 1 and Unit 2.
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