05000295/LER-2011-001, From Zion, Units 1 & 2 Improper Storage of Fuel Rod Storage Canister in Spent Fuel Pool
| ML11257A044 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 09/06/2011 |
| From: | Bouchard G ZionSolutions |
| To: | Document Control Desk, NRC/FSME |
| References | |
| ZS-2011-0599 LER 11-001-00 | |
| Download: ML11257A044 (6) | |
| 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 |
| 2952011001R00 - NRC Website | |
text
ZIONSOLUTIONSLC An EnergySokutjo,,- Co*-,pny 10 CFR 50.73(a)(2)(i)(B)
ZS-2011-0599 September 6, 2011 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Zion Nuclear Power Station (ZNPS), Units 1 and 2 Facility Operating License Nos. DPR-39 and DPR-48 NRC Docket Nos. 5 0-295 and 50-3 04
Subject:
Submittal of Licensee Event Report Number 2011-001 Units I and 2, "Improper Storage of Fuel Rod Storage Canister in Spent Fuel Pool" The enclosed Licensee Event Report (LER) is being submitted in accordance with 10 CFR 50.73, "License event report system." 10 CFR 50.73 (a) requires that a LER for qualifying events be submitted within 60 days after the discovery of the event.
There are no regulatory commitments contained in the attached report. Should you have any questions concerning this submittal, please contact Jim Ashley at (847) 379-2978.
Respectfully, Decommissioning Plant Manager Zion Nuclear Power Station
Enclosure:
LER Number 2011-001-00 cc:
John Hickman, U.S. NRC Senior Project Manager Service List 101 Shiloh Boulevard, Zion
- IL 60099 (224) 789-4016
- Fax: (224) 789-4008 - www.zionsolutionscompany.com
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0104 EXPIRES: 10/31/2013 (10-2010)
, the NRC may not conduct or sponsor, and a person is not required to respond to, the digits/characters for each block) information collection.
- 3. PAGE Zion Station, Unit 1 05000295 1 of 4
- 4. TITLE Improper Storage of Fuel Rod Storage Canister in Spent Fuel Pool
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR SEQUENTIAL REV MONTH DAY YEAR Zion Station, Unit 2 05000304 MONTH_
DAYYEARYEARNUMBER NO._
FACILITY NAME DOCKET NUMBER 07 14 2011 2011 001 00 09 06 2011 N/A N/A
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR§: (Check all that apply)
-] 20.2201(b)
El 20.2203(a)(3)(i)
El 50.73(a)(2)(i)(C)
El 50.73(a)(2)(vii)
Permanently El 20.2201(d)
[I 20.2203(a)(3)(ii)
[1 50.73(a)(2)(ii)(A)
El 50.73(a)(2)(viii)(A)
Defueled El 20.2203(a)(1)
El 20.2203(a)(4)
[I 50.73(a)(2)(ii)(B)
El 50.73(a)(2)(viii)(B)
__ 20.2203(a)(2)(i)
[1 50.36(c)(1)(i)(A)
El 50.73(a)(2)(iii)
El 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL El 20.2203(a)(2)(ii)
El 50.36(c)(1)(ii)(A)
[1 50.73(a)(2)(iv)(A)
El 50.73(a)(2)(x)
El 20.2203(a)(2)(iii)
El 50.36(c)(2)
[I 50.73(a)(2)(v)(A)
El 73.71(a)(4)
El 20.2203(a)(2)(iv)
El 50.46(a)(3)(ii)
El 50.73(a)(2)(v)(B)
E] 73.71(a)(5)
N/A El 20.2203(a)(2)(v)
[E 50.73(a)(2)(i)(A)
E] 50.73(a)(2)(v)(C)
El OTHER [E 20.2203(a)(2)(vi) 0 50.73(a)(2)(i)(B)
El 50.73(a)(2)(v)(D)
Specify in Abstract below or in specification identifying region storage restrictions was limited to fuel assemblies and did not address rod storage.
The personnel approving storage of the FRSC in Region 2 failed to recognize that the FRSC criticality analysis required it to be treated as a fuel assembly.
It should be noted that the TracWorks fuel data management software program was not being utilized at the time the FRSC was relocated to SFP Region 2. Use of the TracWorks software program was later adopted by entering historical records into the database. The problem was not previously identified since no movement of FRSC contained rods was attempted utilizing TracWorks prior to the classroom simulated moves attempted on July 13, 2011.
D. Safety Analysis
There were no safety consequences as a result of this event. The SFP Region 2 rack is designed to accommodate fuel of various initial enrichments which have accumulated burnups within the acceptable domain depicted in PDTS Figure 3.1.3-1, "Fuel Assembly Burnup Limits in Region 2." The high density spent fuel storage racks in Region 2 are designed to assure the effective neutron multiplication factor (K-eff) is less than or equal to 0.95 with the racks fully loaded with fuel of the highest anticipated reactivity based on the acceptable burn up domain identified in PDTS Figure 3.1.3-1 and flooded with unborated water.
In addition to the restriction on fuel assemblies stored in Region 2, a soluble boron concentration limit has been established for the SFP. The abnormal location of a fresh unirradiated fuel assembly of 4.64 weight percent U-235 enrichment in Region 2 could, in the absence of soluble boron result in exceeding a K-eff of 0.95. Rack design calculations have shown that a concentration of 160 ppm boron would be adequate to maintain K-eff less than 0.95 for this misloaded fuel assembly scenario. To allow for uncertainties and provide additional margin, a value of 500 ppm boron was selected as the minimum boron concentration of the SFP as discussed in PDTS 3.1.2, "Spent Fuel Boron Concentration." Therefore, in order for SFP rack K-eff to exceed 0.95, a misloaded fuel assembly in Region 2 concurrent with a SFP boron concentration less than 160 ppm must be present. The SFP boron concentration has been maintained above 500 ppm in accordance with Technical Specification provisions since the SFP rerack in 1993.
In addition to the rack design considerations identified above, a technical review of the FRSC criticality analysis has been performed. It was determined that significant conservatism exists in the FRSC criticality analysis. The technical review concluded that the Zion FRSC, loaded in its current configuration, could be stored in SFP Region 2 without exceeding Region 2 design limits. Therefore, although the as found FRSC storage location was in violation of the restrictions identified in the FRSC criticality analysis, the SFP storage rack K-eff did not exceed the PDTS design basis of 0.95, not crediting soluble boron, while stored in Region 2.
Corrective Actions
The FRSC was determined to be stored in violation of PDTS 3.1.3 on July 14, 2011. In accordance with the provisions of PDTS 3.1.3.A.1, immediate actions were initiated to move the FRSC from Region 2 to Region 1. This activity involved the preparation and approval of move sheets authorizing the movement. Additionally, required fuel handling equipment repairs and operational checks were completed prior to initiating the FRSC move. The FRSC was successfully relocated to SFP Region 1 on July 20, 2011. Administrative controls have been established to identify the FRSC as requiring Region 1 storage.
An extent of condition investigation was also conducted. Based on a review of historical records in conjunction with a review of the TracWorks database, it was concluded that all other fuel assemblies and rods stored in SFP Region 2 are in compliance with the rack design and PDTS requirements.
F. Previous Occurrences
There have been no previous similar events at Zion Station.
3. Component Failure Data
Manufacturer Nomenclature N/A N/A Model N/A Mfg. Part Number N/A Zion Nuclear Power Station, Unit 1 and 2 License Transfer Service List cc:
Mr. Patrick T. Daly Senior VP and General Manager ZionSolutions, LLC 101 Shiloh Boulevard Zion, IL 60099 Patrick Thurman, Esq.
VP Regulatory Affairs, Licensing and Document Control ZionSolutions, LLC 101 Shiloh Boulevard Zion, IL 60099 Gary Bouchard VP Engineering, Ops & Nuclear Security and Decommissioning Plant Manager 101 Shiloh Boulevard Zion, IL 60099 John Hess Executive VP and General Manager Commercial Services 1009 Commerce Park Drive, Ste. 100 Oak Ridge, TN 37830 Thomas Magette Senior VP Nuclear Regulatory Strategy 6350 Stevens Forest Road, Ste. 2000 Columbia, MD 21046 Russ Workman Deputy General Counsel Energy Solutions 423 West 300 South, Ste. 200 Salt Lake City, UT 84101 Illinois Department of Nuclear Safety Office of Nuclear Facility Safety 1035 Outer Park Drive Springfield, IL 62704 Mr. Kent McKenzie Emergency Management Coordinator Lake County Emergency Management Agency 1303 N. Milwaukee Avenue Libertyville, IL 60048-1308 Regional Administrator U.S. NRC, Region III 2443 Warrenville Road Lisle, IL 60532-4352 John E. Matthews Morgan, Lewis & Bockius LLP 1111 Pennsylvania Avenue, NW Washington, DC 20004