BSEP 06-0101, Submittal of Technical Specification Bases Revisions

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Submittal of Technical Specification Bases Revisions
ML062700205
Person / Time
Site: Brunswick  Duke Energy icon.png
Issue date: 09/14/2006
From: Ivey R
Progress Energy Carolinas
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
BSEP 06-0101
Download: ML062700205 (21)
v • d • e


Text

i - 4 jProgress Energy SEP 14 2006 SERIAL: BSEP 06-0101 U. S. Nuclear Regulatory Commission ATIlN: Document Control Desk Washington, DC 20555-0001

Subject:

Brunswick Steam Electric Plant, Unit Nos. 1 and 2 Docket Nos. 50-325 and 50-324/License Nos. DPR-71 and DPR-62 Submittal of Technical Specification Bases Revisions Ladies and Gentlemen:

In accordance with Technical Specification (TS) 5.5.10 for the Brunswick Steam Electric Plant (BSEP), Unit Nos. 1 and 2, Carolina Power & Light Company (CP&L), now doing business as Progress Energy Carolinas, Inc., is submitting Revision 47 to the BSEP, Unit 1 TS Bases and Revision 45 to the BSEP, Unit 2 TS Bases.

Please refer any questions regarding this submittal to Mr. Leonard R. Beller, Supervisor -

Licensing/Regulatory Programs, at (910) 457-2073.

Sincerely, Randy C. Ivey Manager - Support Services Brunswick Steam Electric Plant WRM/wrm

Enclosures:

1. Summary of Revisions to Technical Specification Bases
2. Page Replacement Instructions
3. Unit 1 Technical Specification Bases Replacement Pages
4. Unit 2 Technical Specification Bases Replacement Pages Progress Energy Carolinas, Inc.

Brunswick Nuclear Plant P.O. Box 14290o Southport, NC 28461

i Document Control Desk BSEP 06-0101 / Page 2 cc (with enclosures):

U. S. Nuclear Regulatory Commission, Region II ATTN: Dr. William D. Travers, Regional Administrator Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW, Suite 23T85 Atlanta, GA 30303-8931 U. S. Nuclear Regulatory Commission ATTN: Mr. Eugene M. DiPaolo, NRC Senior Resident Inspector 8470 River Road Southport, NC 28461-8869 U. S. Nuclear Regulatory Commission (Electronic Copy Only)

ATTN: Ms. Brenda L. Mozafari (Mail Stop OWFN 8G9) 11555 Rockville Pike Rockville, MD 20852-2738 Ms. Jo A. Sanford Chair - North Carolina Utilities Commission P.O. Box 29510 Raleigh, NC 27626-0510 Ms. Beverly 0. Hall, Section Chief Radiation Protection Section, Division of Environmental Health North Carolina Department of Environment and Natural Resources 3825 Barrett Drive Raleigh, NC 27609-7221

BSEP 06-0101 Enclosure 1 Page 1 of 2 Summary of Revisions to Technical Specification (TS) Bases Affected Revision' Unit Date Implemented Title/Description 47 1 June 29, 2006

Title:

Suppression Chamber-to-Drywell Stroke 45 2 Testing

Description:

Revision 47 for Unit 1 and 45 for Unit 2 incorporated changes to Section 3.6.1.6.2 of the TS Bases associated with Amendment 240 for Unit 1 and Amendment 268 for Unit 2, issued May 5, 2006.

These amendments revised the frequency for functional (i.e.,

stroke) testing of the suppression chamber-to-drywell vacuum breakers from 31 days to every 92 days, as well as changed the conditions under which steam discharges to the suppression chamber would require additional functional testing.

I Revision 47 for Unit 1 and Revision 45 for Unit 2 incorporated change package TSC-2004-04.

S BSEP 06-0101 Enclosure 2 Page 1 of 2 Page Replacement Instructions - Unit 1 Remove Insert Unit 1 - Bases Book 1 Title Page, Revision 46 Title Page, Revision 47 LOEP-1, Revision 46 LOEP-1, Revision 47 Unit I - Bases Book 2 LOEP-1, Revision 46 LOEP-1, Revision 47 LOEP-2, Revision 46 LOEP-2, Revision 47 B 3.6.1.6-5, Revision 31 B 3.6.1.6-5, Revision 47 B 3.6.1.6-6, Revision 31

BSEP 06-0101 Enclosure 2 Page 2 of 2 Page Replacement Instructions - Unit 2 Remove T Insert Unit 2 - Bases Book 1 Title Page, Revision 44 Title Page, Revision 45 LOEP-1, Revision 44 LOEP-1, Revision 45 Unit 2- Bases Book 2 LOEP-1, Revision 44 LOEP-1, Revision 45 LOEP-2, Revision 44 LOEP-2, Revision 45 B 3.6.1.6-5, Revision 30 B 3.6.1.6-5, Revision 45 B 3.6.1.6-6, Revision 30 ---

Q BSEP 06-0101 Enclosure 3 Unit 1 Technical Specification Bases Replacement Pages

A Unit I - Bases Book 1 Replacement Pages

BASES TO THE FACILITY OPERATING LICENSE DPR-71 TECHNICAL SPECIFICATIONS FOR BRUNSWICK STEAM ELECTRIC PLANT UNIT I CAROLINA POWER & LIGHT COMPANY REVISION 47

LIST OF EFFECTIVE PAGES - BASES Page No. Revision No. Page No. Revision No.

Title Page 47 B 3.1.1-6 31 I B 3.1.2-1 31 List of Effective Pages - Book 1 B 3.1.2-2 31 B 3.1.2-3 31 LOEP-1 47 B 3.1.2-4 31 I LOEP-2 36 B 3.1.2-5 31 LOEP-3 44 B 3.1.3-1 31 LOEP-4 45 B 3.1.3-2 31 B 3.1.3-3 31 i 42 B 3.1.3-4 31 ii 31 B 3.1.3-5 31 B 3.1.3-6 31 B 2.1.1-1 31 B 3.1.3-7 31 B 2.1.1-2 31 B 3.1.3-8 31 B 2.1.1-3 31 B 3.1.3-9 31 B 2.1.1-4 31 B 3.1.4-1 31 B 2.1.1-5 31 B 3.1.4-2 31 B 2.1.2-1 31 B 3.1.4-3 31 B 2.1.2-2 31 B 3.1.4-4 31 B 2.1.2-3 31 B 3.1.4-5 42 B 3.1.4-6 31 B 3.0-1 31 B 3.1.4-7 31 B 3.0-2 31 B 3.1.5-1 31 B 3.0-3 31 B 3.1.5-2 31 B 3.0-4 31 B 3.1.5-3 31 B 3.0-5 41 B 3.1.5-4 31 B 3.0-6 41 B 3.1.5-5 31 B 3.0-7 41 B 3.1.6-1 31 B 3.0-8 41 B 3.1.6-2 31 B 3.0-9 41 B 3.1.6-3 31 B 3.0-10 41 B 3.1.6-4 31 B 3.0-11 41 B 3.1.6-5 31 B 3.0-12 41 B 3.1.7-1 34 B 3.0-13 41 B 3.1.7-2 31 B 3.0-14 41 B 3.1.7-3 31 B 3.0-15 41 B 3.1.7-4 31 B 3.0-16 41 B 3.1.7-5 31 B 3.0-17 41 B 3.1.7-6 34 B 3.1.8-1 31 B 3.1.1-1 31 B 3.1.8-2 37 B 3.1.1-2 31 B 3.1.8-3 37 B 3.1.1-3 31 B 3.1.8-4 31 B 3.1.1-4 31 B 3.1.8-5 31 B 3.1.1-5 31 (continued)

Brunswick Unit 1 LOEP-1 Revision 47 1

Unit I - Bases Book 2 Replacement Pages

LIST OF EFFECTIVE PAGES - BASES Page No. Revision No. Page No. Revision No.

List of Effective Pages - Book 2 B 3.4.7-5 41 B 3.4.8-1 31 LOEP-1 47 B 3.4.8-2 31 LOEP-2 47 B 3.4.8-3 31 LOEP-3 45 B 3.4.8-4 31 LOEP-4 31 B 3.4.8-5 31 LOEP-5 31 B 3.4.9-1 31 B 3.4.9-2 38 i 31 B 3.4.9-3 38 ii 31 B 3.4.9-4 31 B 3.4.9-5 38 B 3.4.1-1 31 B 3.4.9-6 38 B 3.4.1-2 31 B 3.4.9-7 31 B 3.4.1-3 31 B 3.4.9-8 31 B 3.4.1-4 31 B 3.4.9-9 38 B 3.4.1-5 31 B 3.4.10-1 31 B 3.4.1-6 31 B 3.4.10-2 31 B 3.4.2-1 31 B 3.4.2-2 31 B 3.5.1-1 31 B 3.4.2-3 31 B 3.5.1-2 31 B 3.4.2-4 31 B 3.5.1-3 31 B 3.4.3-1 31 B 3.5.1-4 36 B 3.4.3-2 31 B 3.5.1-5 36 B 3.4.3-3 31 B 3.5.1-6 41 B 3.4.3-4 31 B 3.5.1-7 31 B 3.4.4-1 31 B 3.5.1-8 31 B 3.4.4-2 31 B 3.5.1-9 31 B 3.4.4-3 31 B 3.5.1-10 31 B 3.4.4-4 31 B 3.5.1-11 31 B 3.4.4-5 31 B 3.5.1-12 31 B 3.4.5-1 31 B 3.5.1-13 31 B 3.4.5-2 31 B 3.5.1-14 44 B 3.4.5-3 43 B 3.5.1-15 44 B 3.4.5-4 41 B 3.5.1-16 31 B 3.4.6-1 41 B 3.5.1-17 31 B 3.4.6-2 41 B 3.5.2-1 31 B 3.4.6-3 41 B 3.5.2-2 31 B 3.4.7-1 31 B 3.5.2-3 31 B 3.4.7-2 31 B 3.5.2-4 31 B 3.4.7-3 41 B 3.5.2-5 31 B 3.4.7-4 41 B 3.5.2-6 31 B 3.5.3-1 31 B 3.5.3-2 41 (continued)

Brunswick Unit 1 LOEP-1 Revision 47 1

.4 4 LIST OF EFFECTIVE PAGES - BASES (continued)

Page No. Revision No. Page No. Revision No.

B 3.5.3-3 31 B 3.6.1.5-7 31 B 3.5.3-4 31 B 3.6.1.5-8 36 B 3.5.3-5 31 B 3.6.1.5-9 31 B 3.5.3-6 31 B 3.6.1.6-1 31 B 3.5.3-7 31 B 3.6.1.6-2 31 B 3.6.1.6-3 31 B 3.6.1.1-1 31 B 3.6.1.6-4 31 B 3.6.1.1-2 31 B 3.6.1.6-5 47 B 3.6.1.1-3 B 3.6.1.1-4 31 46 B 3.6.2.1-1 31 I

B 3.6.1.1-5 46 B 3.6.2.1-2 31 B 3.6.1.1-6 46 B 3.6.2.1-3 31 B 3.6.1.2-1 31 B 3.6.2.1-4 31 B 3.6.1.2-2 31 B 3.6.2.1-5 31 B 3.6.1.2-3 31 B 3.6.2.2-1 31 B 3.6.1.2-4 31 B 3.6.2.2-2 31 B 3.6.1.2-5 31 B 3.6.2.2-3 31 B 3.6.1.2-6 31 B 3.6.2.3-1 31 B 3.6.1.2-7 46 B 3.6.2.3-2 41 B 3.6.1.2-8 46 B 3.6.2.3-3 41 B 3.6.1.3-1 31 B 3.6.2.3-4 41 B 3.6.1.3-2 31 B 3.6.3.1-1 31 B 3.6.1.3-3 31 B 3.6.3.1-2 31 B 3.6.1.3-4 31 B 3.6.3.1-3 31 B 3.6.1.3-5 31 B 3.6.3.2-1 31 B 3.6.1.3-6 31 B 3.6.3.2-2 31 B 3.6.1.3-7 31 B 3.6.3.2-3 41 B 3.6.1.3-8 31 B 3.6.3.2-4 41 B 3.6.1.3-9 31 B 3.6.3.2-5 41 B 3.6.1.3-10 31 B 3.6.4.1-1 31 B 3.6.1.3-11 31 B 3.6.4.1-2 31 B 3.6.1.3-12 46 B 3.6.4.1-3 31 B 3.6.1.3-13 46 B 3.6.4.1-4 31 B 3.6.1.3-14 46 B 3.6.4.1-5 31 B 3.6.1.4-1 31 B 3.6.4.2-1 31 B 3.6.1.4-2 31 B 3.6.4.2-2 31 B 3.6.1.4-3 31 B 3.6.4.2-3 31 B 3.6.1.5-1 31 B 3.6.4.2-4 31 B 3.6.1.5-2 31 B 3.6.4.2-5 31 B 3.6.1.5-3 31 B 3.6.4.2-6 31 B 3.6.1.5-4 31 B 3.6.4.3-1 31 B 3.6.1.5-5 31 B 3.6.4.3-2 31 B 3.6.1.5-6 31 B 3.6.4.3-3 31 (continued)

Brunswick Unit 1 LOEP-2 Revision 47 1

Suppression Chamber-to-Drywell Vacuum Breakers B 3.6.1.6 BASES SURVEILLANCE SR 3.6.1.6.1 (continued)

REQUIREMENTS and drywell is maintained > 0.5 times the initial differential pressure for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> without nitrogen makeup. The 14 day Frequency is based on engineering judgment, is considered adequate in view of other indications of vacuum breaker status available to operations personnel and procedural controls to ensure the drywell is normally maintained at a higher pressure than the suppression chamber, and has been shown to be acceptable through operating experience. This verification is also required within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> after any discharge of steam to the suppression chamber from any source.

A Note is added to this SR which allows suppression chamber-to-drywell vacuum breakers opened in conjunction with the performance of a Surveillance to not be considered as failing this SR. These periods of opening vacuum breakers are controlled by plant procedures and do not represent inoperable vacuum breakers.

SR 3.6.1.6.2 Each required vacuum breaker must be cycled to ensure that it opens adequately to perform its design function and returns to the fully closed position. This is accomplished by verifying each required vacuum breaker operates through at least one complete cycle of full travel. This SR ensures that the safety analysis assumptions are valid. The 92 day Frequency of this SR was developed, based on Inservice Testing Program requirements to perform valve testing at least once every 92 days. In addition, this functional test is required within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after a discharge of steam to the suppression chamber from the SRVs and within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after an operation that causes any of the vacuum breakers to open.

SR 3.6.1.6.3 Verification of the vacuum breaker opening setpoint is necessary to ensure that the safety analysis assumption regarding vacuum breaker full open differential pressure of 0.5 psid is valid. The 24 month Frequency is based on the need to perform this Surveillance under the conditions that apply during a plant outage and the potential for an unplanned transient if the Surveillance were performed with the reactor at power. The 24 month Frequency has been demonstrated to be acceptable, based on operating experience, and is further-justified because of other surveillances performed more frequently that convey the proper functioning status of each vacuum breaker.

REFERENCES 1. UFSAR, Section 6.2.

2. 10 CFR 50.36(c)(2)(ii).

Brunswick Unit 1 B 3.6.1.6-5 Revision No. 47 I

4 BSEP 06-0101 Enclosure 4 Unit 2 Technical Specification Bases Replacement Pages

10 IC Unit 2 - Bases Book 1 Replacement Pages

0

  • BASES TO THE FACILITY OPERATING LICENSE DPR-62 TECHNICAL SPECIFICATIONS FOR BRUNSWICK STEAM ELECTRIC PLANT UNIT 2 CAROLINA POWER & LIGHT COMPANY REVISION 45

0 LIST OF EFFECTIVE PAGES - BASES Page No. Revision No. Page No. Revision No.

Title Page 45 B 3.1.1-6 30 B 3.1.2-1 30 List of Effective Pages - Book 1 B 3.1.2-2 30 B 3.1.2-3 30 LOEP-1 45 B 3.1.2-4 30 LOEP-2 37 B 3.1.2-5 30 LOEP-3 42 B 3.1.3-1 30 LOEP-4 43 B 3.1.3-2 30 B 3.1.3-3 30 ii 40 B 3.1.3-4 30 30 B 3.1.3-5 30 B 3.1.3-6 30 B 2.1.1-1 30 B 3.1.3-7 30 B 2.1.1-2 30 B 3.1.3-8 30 B 2.1.1-3 30 B 3.1.3-9 30 B 2.1.1-4 30 B 3.1.4-1 30 B 2.1.1-5 30 B 3.1.4-2 30 B 2.1.2-1 30 B 3.1.4-3 30 B 2.1.2-2 30 B 3.1.4-4 30 B 2.1.2-3 30 B 3.1.4-5 40 B 3.1.4-6 30 B 3.0-1 30 B 3.1.4-7 30 B 3.0-2 30 B 3.1.5-1 30 B 3.0-3 30 B 3.1.5-2 30 B 3.0-4 30 B 3.1.5-3 30 B 3.0-5 39 B 3.1.5-4 30 B 3.0-6 39 B 3.1.5-5 30 B 3.0-7 39 B 3.1.6-1 30 B 3.0-8 39 B 3.1.6-2 30 B 3.0-9 39 B 3.1.6-3 30 B 3.0-10 39 B 3.1.6-4 30 B 3.0-11 39 B 3.1.6-5 30 B 3.0-12 39 B 3.1.7-1 30 B 3.0-13 39 B 3.1.7-2 30 B 3.0-14 39 B 3.1.7-3 30 B 3.0-15 39 B 3.1.7-4 30 B 3.0-16 39 B 3.1.7-5 30 B 3.0-17 39 B 3.1.7-6 30 B 3.1.8-1 30 B 3.1.1-1 30 B 3.1.8-2 34 B 3.1.1-2 30 B 3.1.8-3 34 B 3.1.1-3 30 B 3.1.8-4 30 B 3.1.1-4 30 B 3.1.8-5 30 B 3.1.1-5 30 (continued)

Brunswick Unit 2 LOEP-1 Revision 45 1

0 Unit 2 - Bases Book 2 Replacement Pages

LIST OF EFFECTIVE PAGES - BASES Page No. Revision No. Page No. Revision No.

Title Page N/A B 3.4.7-4 39 B 3.4.7-5 39 List of Effective Pages - Book 2 B 3.4.8-1 30 B 3.4.8-2 30 LOEP-1 LOEP-2 LOEP-3 45 45 43 B

B B

3.4.8-3 3.4.8-4 3.4.8-5 30 30 30 I

LOEP-4 30 B 3.4.9-1 30 LOEP-5 30 B 3.4.9-2 35 B 3.4.9-3 35 ii 30 B 3.4.9-4 30 30 B 3.4.9-5 35 B 3.4.9-6 35 B 3.4.1-1 30 B 3.4.9-7 30 B 3.4.1-2 30 B 3.4.9-8 30 B 3.4.1-3 30 B 3.4.9-9 35 B 3.4.1-4 30 B 3.4.10-1 30 B 3.4.1-5 30 B 3.4.10-2 30 B 3.4.1-6 30 B 3.4.2-1 30 B 3.5.1-1 30 B 3.4.2-2 30 B 3.5.1-2 30 B 3.4.2-3 30 B 3.5.1-3 30 B 3.4.2-4 30 B 3.5.1-4 33 B 3.4.3-1 30 B 3.5.1-5 33 B 3.4.3-2 30 B 3.5.1-6 39 B 3.4.3-3 30 B 3.5.1-7 30 B 3.4.3-4 30 B 3.5.1-8 30 B 3.4.4-1 30 B 3.5.1-9 30 B 3.4.4-2 30 B 3.5.1-10 30 B 3.4.4-3 30 B 3.5.1-11 30 B 3.4.4-4 30 B 3.5.1-12 30 B 3.4.4-5 30 B 3.5.1-13 30 B 3.4.5-1 30 B 3.5.1-14 30 B 3.4.5-2 30 B 3.5.1-15 42 B 3.4.5-3 41 B 3.5.1-16 42 B 3.4.5-4 39 B 3.5.1-17 30 B 3.4.6-1 39 B 3.5.2-1 30 B 3.4.6-2 39 B 3.5.2-2 30 B 3.4.6-3 39 B 3.5.2-3 30 B 3.4.7-1 30 B 3.5.2-4 30 B 3.4.7-2 30 B 3.5.2-5 30 B 3.4.7-3 39 B 3.5.2-6 30 B 3.5.3-1 30 B 3.5.3-2 39 (continued)

Brunswick Unit 2 LOEP-1 Revision 45 1

0 f 0 &

LIST OF EFFECTIVE PAGES - BASES (continued)

Page No. Revision No. Page No. Revision No.

B 3.5.3-3 30 B 3.6.1.5-7 30 B 3.5.3-4 30 B 3.6.1.5-8 33 B 3.5.3-5 30 B 3.6.1.5-9 30 B 3.5.3-6 30 B 3.6.1.6-1 30 B 3.5.3-7 30 B 3.6.1.6-2 30 B 3.6.1.6-3 30 B 3.6.1.1-1 30 B 3.6.1.6-4 30 B 3.6.1.1-2 30 B 3.6.1.6-5 45 B 3.6.1.1-3 B 3.6.1.1-4 30 44 B 3.6.2.1-1 30 I

B 3.6.1.1-5 44 B 3.6.2.1-2 30 B 3.6.1.1-6 44 B 3.6.2.1-3 30 B 3.6.1.2-1 30 B 3.6.2.1-4 30 B 3.6.1.2-2 30 B 3.6.2.1-5 30 B 3.6.1.2-3 30 B 3.6.2.2-1 30 B 3.6.1.2-4 30 B 3.6.2.2-2 30 B 3.6.1.2-5 30 B 3.6.2.2-3 30 B 3.6.1.2-6 30 B 3.6.2.3-1 30 B 3.6.1.2-7 44 B 3.6.2.3-2 39 B 3.6.1.2-8 44 B 3.6.2.3-3 39 B 3.6.1.3-1 30 B 3.6.2.3-4 39 B 3.6.1.3-2 30 B 3.6.3.1-1 30 B 3.6.1.3-3 30 B 3.6.3.1-2 30 B 3.6.1.3-4 30 B 3.6.3.1-3 30 B 3.6.1.3-5 30 B 3.6.3.2-1 30 B 3.6.1.3-6 30 B 3.6.3.2-2 30 B 3.6.1.3-7 30 B 3.6.3.2-3 39 B 3.6.1.3-8 30 B 3.6.3.2-4 39 B 3.6.1.3-9 30 B 3.6.3.2-5 39 B 3.6.1.3-10 30 B 3.6.4.1-1 30 B 3.6.1.3-11 30 B 3.6.4.1-2 30 B 3.6.1.3-12 44 B 3.6.4.1-3 30 B 3.6.1.3-13 44 B 3.6.4.1-4 30 B 3.6.1.3-14 44 B 3.6.4.1-5 30 B 3.6.1.4-1 30 B 3.6.4.2-1 30 B 3.6.1.4-2 30 B 3.6.4.2-2 30 B 3.6.1.4-3 30 B 3.6.4.2-3 30 B 3.6.1.5-1 30 B 3.6.4.2-4 30 B 3.6.1.5-2 30 B 3.6.4.2-5 30 B 3.6.1.5-3 30 B 3.6.4.2-6 30 B 3.6.1.5-4 30 B 3.6.4.3-1 30 B 3.6.1.5-5 30 B 3.6.4.3-2 30 B 3.6.1.5-6 30 B 3.6.4.3-3 30 (continued)

Brunswick Unit 2 LOEP-2 Revision 45 1

4 V. 44 Suppression Chamber-to-Drywell Vacuum Breakers B 3.6.1.6 BASES SURVEILLANCE SR 3.6.1.6.1 (continued)

REQUIREMENTS and drywell is maintained > 0.5 times the initial differential pressure for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> without nitrogen makeup. The 14 day Frequency is based on engineering judgment, is considered adequate in view of other indications of vacuum breaker status available to operations personnel and procedural controls to ensure the drywell is normally maintained at a higher pressure than the suppression chamber, and has been shown to be acceptable through operating experience. This verification is also required within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> after any discharge of steam to the suppression chamber from any source.

A Note is added to this SR which allows suppression chamber-to-drywell vacuum breakers opened in conjunction with the performance of a Surveillance to not be considered as failing this SR. These periods of opening vacuum breakers are controlled by plant procedures and do not represent inoperable vacuum breakers.

SR 3.6.1.6.2 Each required vacuum breaker must be cycled to ensure that it opens adequately to perform its design function and returns to the fully closed position. This is accomplished by verifying each required vacuum breaker operates through at least one complete cycle of full travel. This SR ensures that the safety analysis assumptions are valid. The 92 day Frequency of this SR was developed, based on Inservice Testing Program requirements to perform valve testing at least once every 92 days. In addition, this functional test is required within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after a discharge of steam to the suppression chamber from the SRVs and within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> after an operation that causes any of the vacuum breakers to open.

SR 3.6.1.6.3 Verification of the vacuum breaker opening setpoint is necessary to ensure that the safety analysis assumption regarding vacuum breaker full open differential pressure of 0.5 psid is valid. The 24 month Frequency is based on the need to perform this Surveillance under the conditions that apply during a plant outage and the potential for an unplanned transient if the Surveillance were performed with the reactor at power. The 24 month Frequency has been demonstrated to be acceptable, based on operating experience, and is further justified because of other surveillances performed more frequently that convey the proper functioning status of each vacuum breaker.

REFERENCES 1. UFSAR, Section 6.2.

2. 10 CFR 50.36(c)(2)(ii).

Brunswick Unit 2 B 3.6.1.6-5 Revision No. 45 I

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