Letter Sequence Other |
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MONTHYEARML0209101702002-04-0404 April 2002
Documentation of Conference Call to Calvert Cliffs Nuclear Power Plant, Unit No. 1 and 2 on March 26, 2002, Regarding Reactor Vessel Head Inspection Activities
Project stage: Other
ML0214302462002-05-28028 May 2002
Bulletin 2002-01, Reactor Pressure Vessel Head Degradation and Reactor Coolant Pressure Boundary Integrity, 15-Day Response
Project stage: Other
ML0224000952002-09-0606 September 2002
Bulletin 2002-01, Reactor Pressure Vessel Head Degradation and Reactor Coolant Pressure Boundary Integrity, 15-Day Response for Calvert Cliffs Nuclear Power Plant, Unit No. 1 (Tac MB4533)
Project stage: Other
ML0232304472002-11-19019 November 2002
Bulletin 2002-01, Reactor Pressure Vessel Head Degradation and Reactor Coolant Pressure Boundary Integrity, 60-Day Response for Calvert Cliffs Nuclear Power Plant, Unit Nos. 1 and 2 Request for Additional Information
Project stage: RAI
ML0306400672003-02-28028 February 2003
BL2002-01 60-Day Response Draft Audit Plan
Project stage: Draft Other
2002-05-28
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Category:Memoranda
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Documentation of Conference Call to Calvert Cliffs Nuclear Power Plant, Unit No. 1 and 2 on March 26, 2002, Regarding Reactor Vessel Head Inspection Activities
2021-05-21
[Table view] |
Text
April 4, 2002 MEMORANDUM TO: Joel Munday, Acting Chief, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation FROM: Donna Skay, Project Manager, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation
SUBJECT:
DOCUMENTATION OF CONFERENCE CALL TO CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NO. 1 ON MARCH 26, 2002, REGARDING REACTOR VESSEL HEAD INSPECTION ACTIVITIES (TAC NO. MB4533)
On March 26, 2002, the NRC staff had a conference call with Calvert Cliffs Nuclear Power Plant, Inc. (CCNPPI) to discuss the results of their reactor vessel head inspections for Unit 1 and potential impact of the Davis-Besse control rod drive mechanism (CRDM) inspection findings (see: NRC BULLETIN 2002-01, dated March 18, 2002.) During the March 26, 2002, call, CCNPPI addressed the following areas.
- 1. Inspection of the reactor vessel head: The licensee performed a qualified visual inspection of 100% of the nozzles on the vessel head underneath the insulation. These inspections were performed with a video probe. The licensee found some boric acid residue during the inspections but found no indication of degradation of the reactor vessel head.
- 2. History of boric acid leaks: The licensee stated that a leakage event in 1994 from instrumentation nozzle flanges left boric acid residue around two of the flanges. The residue was cleaned up during the current inspection. After removal of the residue, the licensee found no evidence of corrosion. This was the first bare metal inspection of the area since the leakage in 1994 and no additional leakage events have occurred since then.
In conclusion, the inspections of Calvert Cliffs, Unit 1 did not identify any degradation of the reactor vessel head similar to that observed at Davis-Besse. Based on the preliminary findings from Davis-Besse, the inspections performed by the licensee, and the licensee's susceptibility to nozzle cracking, the NRC staff did not identify any issues that needed additional follow-up prior to plant restart. The staff will document its formal review after receiving the licensee's Bulletin 2002-01 response.
Docket No. 50-317
MEMORANDUM TO: Joel Munday, Acting Chief, Section 1 Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation FROM: Donna Skay, Project Manager, Section 1 /RA/
Project Directorate I Division of Licensing Project Management Office of Nuclear Reactor Regulation
SUBJECT:
DOCUMENTATION OF CONFERENCE CALL TO CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NO. 1 ON MARCH 26, 2002, REGARDING REACTOR VESSEL HEAD INSPECTION ACTIVITIES (TAC NO. MB4533)
On March 26, 2002, the NRC staff had a conference call with Calvert Cliffs Nuclear Power Plant, Inc. (CCNPPI) to discuss the results of their reactor vessel head inspections for Unit 1 and potential impact of the Davis-Besse control rod drive mechanism (CRDM) inspection findings (see: NRC BULLETIN 2002-01, dated March 18, 2002.) During the March 26, 2002, call, CCNPPI addressed the following areas.
- 1. Inspection of the reactor vessel head: The licensee performed a qualified visual inspection of 100% of the nozzles on the vessel head underneath the insulation. These inspections were performed with a video probe. The licensee found some boric acid residue during the inspections but found no indication of degradation of the reactor vessel head.
- 2. History of boric acid leaks: The licensee stated that a leakage event in 1994 from instrumentation nozzle flanges left boric acid residue around two of the flanges. The residue was cleaned up during the current inspection. After removal of the residue, the licensee found no evidence of corrosion. This was the first bare metal inspection of the area since the leakage in 1994 and no additional leakage events have occurred since then.
In conclusion, the inspections of Calvert Cliffs, Unit 1 did not identify any degradation of the reactor vessel head similar to that observed at Davis-Besse. Based on the preliminary findings from Davis-Besse, the inspections performed by the licensee, and the licensee's susceptibility to nozzle cracking, the NRC staff did not identify any issues that needed additional follow-up prior to plant restart. The staff will document its formal review after receiving the licensee's Bulletin 2002-01 response.
Docket No. 50-317 DISTRIBUTION PUBLIC R. Laufer Sam Collins Brian Sheron D. Skay Jon Johnson Bill Kane S. Bloom Bill Borchardt M. Evans, RGI S. Little Mike Case PDI-1 Reading ACCESSION No. ML020910170 *See previous concurrence OFFICE PDI-1/PM PDI-/LA NRR/EMCB (A)SC:PDI-1 NAME DSkay SLittle SBloom* JMunday DATE 4/04/02 4/04/02 4/04/02 4/04/02 OFFICIAL RECORD COPY
