ML12213A355
| ML12213A355 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 11/26/2011 |
| From: | Jacob Zimmerman NRC/OCM |
| To: | Marilyn Evans, Hernandez P, Michael Mahoney Division of Operating Reactor Licensing |
| References | |
| FOIA/PA-2012-0121 | |
| Download: ML12213A355 (4) | |
Text
Craver, Patti Craver, Patt From:
Sent:
To:
Cc:
Subject:
Attachments:
Zimmerman, Jacob Saturday, November 26, 2011 9:43 PM Evans, Michele Howe, Allen; Mahoney, Michael; Hernandez, Pete; Hiland, Patrick FYI: Davis-Besse Draft CAL CAL 3-11-001 Davis-Besse Commitments Draft.docx Michele Attached is a draft CAL prepared by Region 3. It will need your review and concurrence for NRR on Monday. I reviewed it and don't have any comments. I recommend that you review it, so you are prepared for when it officially comes to NRR for review and concurrence.
Region 3 sent inspectors back to Davis Besse today. They continue to talk with FENOC folks about the shield building and their documentation/calculations on the cracking issue.
Steve Reynolds called me at home tonight to inform me that there will be an internal NRC call tomorrow (Sunday) at 12 noon to discuss the current status and the technical issues associated with the cracking. A bridge number is being set up and will be emailed out by Region 3. I plan to call in. I don't think it is necessary for you to be on the call, unless you would like to.
I'll keep you informed as this activity progresses.
Very respectfully Jake 1
DRAFT November 25, 2011 CAL No. 3-11-001 Mr. Barry Allen Site Vice President FirstEnergy Nuclear Operating Company Davis-Besse Nuclear Power Station 5501 North State Route 2, Mail Stop A-DB-3080 Oak Harbor, OH 43449-9760
SUBJECT:
CONFIRMATORY ACTION LETTER - DAVIS-BESSE NUCLEAR POWER STATION
Dear Mr. Allen:
This letter confirms commitments by FirstEnergy Nuclear Operating Company (FENOC) regarding the identification of cracks in the reinforced concrete shield building at the Davis-Besse Nuclear Power Station. During the recent mid-cycle outage to replace the reactor vessel closure head, which began on October 1, 2011, FENOC discovered laminar cracking in the safety-related shield building of the containment system while performing hydrodemolition operations. Based on an evaluation of FENOC's extent of condition and technical analysis of the Davis-Besse shield building laminar cracking, the NRC staff concluded that FENOC provided reasonable assurance that the shield building is capable of performing its design safety function. However, to provide continued confidence for the longer term, FENOC has agreed in telephone conversations between you, Steven West, and Steven Reynolds on November 21, 2011; a followup telephone conversation between you and Jamnes Cameron on November 22, 2011; and in a FENOC commitment letter dated November 23, 2011 (ML11329A033) to the following actions:
- 1. FENOC will provide the results of the root cause evaluation and corrective actions to the NRC, including any long-term monitoring requirements, by February 28, 2012.
- 2. FENOC will identify four locations of the Shield Building which were core bored during this evaluation for examination. These uncracked locations will be directly adjacent to locations that have been confirmed to be cracked. The four uncracked locations are:
- a. adjacent to a flute shoulder [S9-666.0-12],
- b. in a flute area [F4-1-666.0-3],
- c. adjacent to Main Steam Line penetration 39 [S7-652.0-6.5], and
- d. adjacent to Main Steam Line penetration 40 [S9-650.0-9].
- 3. FENOC will examine the four core bore locations from Commitment 2 above with a bore scope to verify cracking has not migrated to these core bores located in solid concrete, ninety days following plant restart (mode 2) from the 2011 mid-cycle outage.
- 4. FENOC will examine the crack interface to identify any changes by performing a core bore in a known crack area within the Main Steam Line Room, ninety days following plant restart (mode 2) from the 2011 mid-cycle outage.
- 5. FENOC will identify two additional locations of the Shield Building which were core bored during this evaluation for examination. These uncracked locations will be directly adjacent to locations that have been confirmed to be cracked. The two uncracked locations are:
- a. in a flute area [F5-777.0-4], and
- b. adjacent to a flute shoulder [S2-783.5-4.0].
- 6. FENOC will examine the four core bore locations from Commitment 2 along with the two core bore locations from Commitment 5 with a bore scope to verify cracking has not migrated to these core bores located in solid concrete, during the seventeenth refueling outage currently scheduled to commence on May 6, 2012.
- 7. FENOC will examine the crack interface to identify any changes by examining either existing core bore locations with known cracks, or by performing a core bore in a similar area:
- a. adjacent to a flute shoulder [S9-666.0-11],
- b. near the top of the Shield Building [S9-785-22.5], and
- c. adjacent to Main Steam Line penetration [core bore from Commitment #4]
during the seventeenth refueling outage, currently scheduled to commence on May 6, 2012.
Pursuant to Section 182 of the Atomic Energy Act, 42 U.S.C. 2232, you are required to:
- 1) Notify me immediately if your understanding differs from that set forth above;
- 2) Notify me if for any reason you cannot complete the actions and commitments within the specified schedule and advise me in writing of your modified schedule in advance of the change; and
- 3) Notify me in writing when you have completed the actions and commitments addressed in this Confirmatory Action Letter.
Issuance of this Confirmatory Action Letter does not preclude issuance of an Order formalizing the above commitments or requiring other actions on the part of the licensee, nor does it preclude the NRC from taking enforcement action for violations of NRC requirements that may have prompted the issuance of this letter. Failure to meet the commitments in a Confirmatory Action Letter may result in an order if the licensee's performance, as demonstrated by the failure to meet Confirmatory Action Letter commitments, does not provide reasonable assurance that the NRC can rely on the licensee to meet the NRC's requirements and protect public health and safety or the common defense and security.
In accordance with 10 CFR 2.390 of the NRC's "Rules of Practice," a copy of this letter, its enclosure, and your response will be made available electronically for public inspection in the NRC Public Document Room or Publicly Available Records System (PARS) component of NRC's document system (ADAMS). ADAMS is accessible from the NRC website at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room). To the extent possible, your response should not include any personal privacy, proprietary, or safeguards information so that it can be made available to the Public without redaction. If personal privacy or proprietary information is necessary to provide an acceptable response, then please provide a bracketed copy of your response that identifies the information that should be protected and a
b redacted copy of your response that deletes such information. If you request withholding of such material, you must specifically identify the portions of your response that you seek to have withheld and provide in detail the bases for your claim of withholding (e.g., explain why the disclosure of information will create an unwarranted invasion of personal privacy or provide the information required by 10 CFR 2.390(b) to support a request for withholding confidential commercial or financial information). If safeguards information is necessary to provide an acceptable response, please provide the level of protection described in 10 CFR 73.21.
Sincerely, IRA!
Cynthia Pederson Acting Regional Administrator Docket No. 50-346 License No. NPF-3 cc: Distribution via ListServe