05000352/LER-2011-001, Regarding 1B Reactor Enclosure Recirculation System Charcoal Sample Analysis Results Exceeded TS Limit

Regarding 1B Reactor Enclosure Recirculation System Charcoal Sample Analysis Results Exceeded TS Limit

ML111880157
Person / Time
Site:	Limerick
Issue date:	07/07/2011
From:	Maguire W Exelon Generation Co, Exelon Nuclear
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
LER 11-001-00
Download: ML111880157 (5)

LER-2011-001, Regarding 1B Reactor Enclosure Recirculation System Charcoal Sample Analysis Results Exceeded TS Limit

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii)(A), Seriously Degraded 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function
3522011001R00 - NRC Website

text

10CFR50.73 July 7, 2011 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Limerick Generating Station, Unit 1 Facility Operating License No. NPF-39 NRC Docket No. 50-352

Subject:

LER 2011-001-00, 1B Reactor Enclosure Recirculation System This Licensee Event Report (LER) addresses an event that resulted in a condition prohibited by Technical Specifications as a result of a failed charcoal analysis on the 1B Reactor Enclosure Recirculation System.

This LER is being submitted pursuant to the requirements of 10CFR50.73(a)(2)(i)(B).

There are no commitments contained in this letter.

If you have any questions, please contact John Hunter III at (610) 718-3400.

Respectfully, Original signed by William F. Maguire Vice President - Limerick Exelon Generation Company, LLC cc:

Administrator Region I, USNRC USNRC Senior Resident Inspector, LGS

NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (10-2010)

LICENSEE EVENT REPORT (LER)

(See reverse for required number of digits/characters for each block)

APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2013

, the NRC may not conduct or sponsor, and a person is not required to respond to, the information collection.

1. FACILITY NAME Limerick Generating Station, Unit 1

2. DOCKET NUMBER 05000352

3. PAGE 1 OF 4

4. TITLE 1B Reactor Enclosure Recirculation System Charcoal Sample Analysis Results Exceeded TS Limit

5. EVENT DATE

6. LER NUMBER

7. REPORT DATE

8. OTHER FACILITIES INVOLVED MONTH DAY YEAR YEAR SEQUENTIAL NUMBER REV NO.

MONTH DAY YEAR FACILITY NAME DOCKET NUMBER 05000 05 09 2011 2011 - 001 - 00 07 07 2011 FACILITY NAME DOCKET NUMBER 05000

9. OPERATING MODE 1

10. POWER LEVEL 100

11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply) 20.2201(b) 20.2203(a)(3)(i) 50.73(a)(2)(i)(C) 50.73(a)(2)(vii) 20.2201(d) 20.2203(a)(3)(ii) 50.73(a)(2)(ii)(A) 50.73(a)(2)(viii)(A) 20.2203(a)(1) 20.2203(a)(4) 50.73(a)(2)(ii)(B) 50.73(a)(2)(viii)(B) 20.2203(a)(2)(i) 50.36(c)(1)(i)(A) 50.73(a)(2)(iii) 50.73(a)(2)(ix)(A) 20.2203(a)(2)(ii) 50.36(c)(1)(ii)(A) 50.73(a)(2)(iv)(A) 50.73(a)(2)(x) 20.2203(a)(2)(iii) 50.36(c)(2) 50.73(a)(2)(v)(A) 73.71(a)(4) 20.2203(a)(2)(iv) 50.46(a)(3)(ii) 50.73(a)(2)(v)(B) 73.71(a)(5) 20.2203(a)(2)(v) 50.73(a)(2)(i)(A) 50.73(a)(2)(v)(C)

OTHER 20.2203(a)(2)(vi) 50.73(a)(2)(i)(B) 50.73(a)(2)(v)(D)

Specify in Abstract below or in LICENSEE EVENT REPORT (LER)

CONTINUATION SHEET Previous Similar Occurrences There was one previous similar event during the last three years where charcoal sample analysis results rendered the "A" Control Room Emergency Fresh Air Supply (CREFAS) subsystem inoperable. This event was reported in LER 2009-002. The corrective action for this event was to add charcoal bed age and penetration data as inputs to bed performance monitoring and replacement decision making. This corrective action was implemented and resulted in a request by the System Manager on July 13, 2009 to change the 1B RERS charcoal bed based on age. However, it did not prevent recurrence due to unanticipated resource and charcoal replacement equipment issues.

Component data:

System:

Reactor Enclosure Recirculation System Component:

ADS Adsorber Component Number: 1B-F261 Manufacturer:

C780 CVI Corp