ML052500491
| ML052500491 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 08/31/2005 |
| From: | Garrett T Wolf Creek |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| BL-03-001, ET 05-0019 | |
| Download: ML052500491 (4) | |
Text
WOF CREEK
'NUCLEAR OPERATING CORPORATION August 31, 2005 ET 05-0019 Terry J Garrett Vice President, Engineering U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555
Reference:
Subject:
Letter WM 04-0050, dated November 5, 2004, from Richard A.
Docket No. 50-482: Supplemental Response to NRC Request for Additional Information Related to Bulletin 2003-01 Gentlemen:
In accordance with 10 CFR 50.54(f), this letter supplements the reference Wolf Creek Nuclear Operating Corporation (WCNOC) response to NRC Request for Additional Information Related to Bulletin 2003-01 dated November 5, 2004. There are no commitments contained within this correspondence.
If you have any questions concerning this matter, please contact me at (620) 364-4084, or Mr.
Kevin Moles at (620) 364-4126.
- yours, J. Garrett TJG/rIg Attachment I: Oath Attachment II: WCNOC Response cc:
J. N. Donohew (NRC), w/a W. B. Jones (NRC), w/a B. S. Mallett (NRC), w/a Senior Resident Inspector (NRC), w/a P.O. Box 411 / Burlington, KS 66839 / Phone: (620) 364-8831 An Equal Opportunity Employer MIF/HCOVET 1O3
Attachment I to ET 05-0019 Page 1 of 1 STATE OF KANSAS
)
) SS COUNTY OF COFFEY )
I Terry J. Garrett, of lawful age, being first duly sworn upon oath says that he is Vice President Engineering of Wolf Creek Nuclear Operating Corporation; that he has read the foregoing document and knows the contents thereof; that he has executed the same for and on behalf of said Corporation with full power and authority to do so; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.
Terry arrett Vice resident Engineering SUBSCRIBED and sworn to before me this 3/
day ofP1
., 2005.
- F°i9Y3P~a*
RHONDA L GLEUE STAMOFKANSAS MYPPEX' (Nty Panul Notary Public
,--"P Expiration Date USA A1 IS0
Attachment II to ET-0019 Page 1 of 2 Supplemental Information for Bulletin 2003-01, "Potential Impact of Debris Blockage on Emergency Sump Recirculation At Pressurized-Water Reactors" A phone call between NRC and Wolf Creek Nuclear Operating Corporation (WCNOC) was held on 7/29/2005 concerning a question on WCNOC's November 5, 2004 Response to Request for Additional Information for Bulletin 2003-01.
The NRC requested that WCNOC provide information on injection of more than one refueling water storage tank (RWST) volume during a potential emergency recirculation sump blockage event.
Even though WCNOC did not implement Candidate Operator Action 6 of WCAP 16204, the following methods are available to inject more than one RWST volume into containment:
- 1. Injection from a refilled RWST
- 2. Injection from alternate source (bypassing RWST)
Method 1 above is implemented in WCNOC Emergency Operating Procedure EMG C-13, 'Control Room Response to Sump Blockage," which states in Step 10: "Try to establish High Head Pressure SI with Suction from the RWST."
Step 10 begins the injection of water from the RWST following the containment spray swapover and any water that has been added from steps initiated in EMG C-12, "Transfer to Cold Leg Recirculation."
Method 2 above is implemented at Wolf Creek Generating Station by several different procedure and process mechanisms.
Guidance and training given to Engineering teams performing assessments of plant conditions and configurations in accident conditions, including assessments of situations covered by the emergency plan as well as severe accident management situations, is often general in nature.
- However, guidance documents and the training and experience of personnel performing these assessments allows them to consider numerous sources of injecting water into the reactor coolant system (RCS) and/or containment, other than injecting through the RWST. These include typical plant configurations and system lineups for injecting non-RWST sources into the RCS such as (1) transfer of Recycle Holdup Tank (RHUT) contents to the RCS via the charging pump suction, (2) transfer of Spent Fuel Pool contents by way of the cleanup system to the RHUT and then to the RCS, (3) lineups to fire protection water sources from various plant connection points to the RCS, (4) reactor makeup water to boric acid batching tank by way of the boric acid transfer pump to the RCS, and (5) low flow rate normal makeup water from the chemical mixing system to the volume control tank (VCT).
In addition, specific WCNOC procedural guidance implements method 2 above.
Procedure EMG C-13, steps 44 thru 47 attempt to establish normal charging to the RCS by way of the volume control tank makeup. Procedure EMG C-1 1, "Loss of Emergency Coolant Recirculation," includes a high level action for injecting non-RWST sources into the RCS, which would include the assessment of the alternate sources discussed above. Also, EMG FR-C1, "Response to Inadequate Core Cooling," and EMG FR-C2,
Attachment II to ET-0019 Page 2 of 2
'Response to Degraded Core Cooling," would be used for core recovery contingent actions if core cooling becomes inadequate or degraded prior to transitioning to the guidance of the applicable Severe Accident Management Guidelines, if necessary, in a beyond design basis situation.
These contingency actions would also include the assessment of the alternate injection pathways discussed above.