ML20209H521

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Forwards Request for Addl Info Re Licensee Proposed Alternate Repair Criteria for Axial Tube End crack-like Indications in CR-3 once-through Steam Generators in Order to Complete Review
ML20209H521
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 07/16/1999
From: Wiens L
NRC (Affiliation Not Assigned)
To: Cowan J
FLORIDA POWER CORP.
References
TAC-MA5395, NUDOCS 9907200242
Download: ML20209H521 (5)


Text

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' Mr. John Paul Cow:n

~ Vice President, Nucle:r Oper;tions . July 16, 1999 Florida Power Corpor; tion l

, ATTN: Manager, Nuclear Licensing (SA2A) {

Crystal River Energy Complex  !

15760 W. Power Line Street l Crystal River, Florida 344284708

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SUBJECT:

CRYSTAL RIVER UNIT 3 - REQUEST FOR ADDITIONAL INFORMATION -

ONCE THROUGH STEAM GENERATOR ALTERNATE REPAIR CRITERIA (TAC NO. MA5395)

Dear Mr. Cowan:

In a submittal dated May 5,1999, Florida Power Corporation submitted a request for an amendment to the Crystal River Unit 3 (CR-3) operating license. The request proposed an attemate repair criteria for axial tube end crack-like indications in the CR-3 Once-Through Steam Generators, in order to complete our review of this request, we require additional j information as specified in the enclosure to this letter. Please provide the requested information within 45 days of receipt of this letter. This Request for Additional Information and I requested submittal date were discussed with Mr. Sidney Powell of your. staff.

Sincerely, l

Original signed by: l Leonard A. Wiens, Senior Project Manager, Section 2 )

Project Directorate ll ]

Division of Licensing Project Management- 1 Office of Nuclear Reactor Regulation  ;

Docket: 50-302

Enclosure:

Request for AdditionalInformation g g Q% hh cc w/ encl: See next page DISTR!BUTION:  ;

, Docket File c OGC I SBlack (w/o encl)

PUBLIC LWiens ACRS I g l Crystal r/f BClayton LWert, Rll l JTsao SPeterson DOCUMENT NAME: G:\PDil-2\ Crystal \RAIA5395.WPD To recalve a copy of this document, indicate in the box: "C" = Copy without attachmer.t/ enclosure "E" = Copy with ettachment/ enclosure "N" = No copy 0FFICE PD!l 2\PM , i liC PDII 2/LA aj l PDII-2\ G l l NAME LWiens /F BCteyton /'8 - SPetermo d '

DATE 07/ M /9f' 07/ f K/99 07/f(,/99 07/ /99 0FFICIAL RECORD COPY ,

9907200242 990716 PDR ADOCK 05000302 P PDR j j

[ o,, UNITED STATES 8 a NUCLEAR REGULATORY COMMISSION

,* 5 E WASHINGTON, D. C. 20555 July 16, 1999 k***** i I

Mr. John Paul Cowan Vice President, Nuclear Operations '

i Florida Power Corporation . , .

i ATTN: Manager, Nuclear Licensing (SA2A) * -

3  ;

Crystal River Energy Complex '

15760 W. Power Line Street - -

Crystal River, Florida 34428-6708

SUBJECT:

CRYSTAL RIVER UN'T 3 - REQUEST FOR ADDITIONAL INFORMATION - ,

ONCE THROUGH STEAM GENERATOR ALTERNATE REPAIR CRITERIA R (TAC NO. MA5395) {

Dear Mr. Cowan:

In a submittal dated May 5,1999, Florida Power Corporation submitted a request for an -

u "1dment to the Crystal River Unit 3 (CR-3) operating license. The request proposed an .

s . rnate repair criteria for axial tube end crack-like indications in the CR-3 Once-Through

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Steam Generators. In order to complete our review of this request, we require additional 3 information as specified in the enclosure to this letter. Please provide the requested ,

information within 45 days of receipt of this letter. This Request for AdditionalInformation and requested submittal date were discussed with Mr. Sidney Powell of your staff.

Sincerely, Q

Leonard A. Wiens, Senior Project Manager, Section 2 Project Directorate ll Division of Licensing Project Management Office of Nuclear Reactor Regulation

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Docket: 50-302

Enclosure:

Request for Additionalinformation ccw/enci: See next page

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. _ REQUEST FOR ADDITIONAL INFORMATION ALTERNATE REPAIR CRITERIA FOR AXIAL TUBE END CRACKS FOR STEAM GENERATOR TUBING CRYSTAL RIVER UNIT 3 in letters dated May 5, and May 28,1999, Florida Power Corporation submitted for staff review an amendment request to revise Crystal River Unit 3 Technical Specifications (TS). The i proposed amendment is to implement attemete repair criteria for axial tube end crack-like (TEC) indications in the upper and lower tubesheets of Crystal River steam generators. The altamate repair criteria would allow tubes having axially oriented TEC indications located within the clad region of the tubesheet to remain in service. In order to continue its review, the staff l requests the following additional information: , ,

l Questions on the May 5.1999 letter '

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1. TS 5.6.2.10.2.f it is stated that tube ends with axial TEC indications will be in spected using i the motorized rotating coil during each subsequent inspection. The TS wording does not state  ;

! that other tube ends will be inspected with rotating coil during subsequent inspections. Please ,

! clarify. In addition, please revise the proposed TS to address sample inspections and sample l

expansion of tube ends not identified in previous inspections.

2. TS 5.6.2.10.2.f BAW-2346P is referenced in the TS without the associated revision number. On the cover page of the May 5,1999 letter, the licensee referenced BAW-2346P, Revision O. The revision number, Revision 0, needs to be included in the TS.

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3. TS 5.6.2.10.4.a.11 It is stated that axial TEC indications acceptable for continued service  !

must be such that the major dimension is within 45 degrees of the vertical axis of the tube. l BAW-2346P did not discuss how the 45 degree flaw angle is determined by the eddy current technique. Describe the eddy current method and associated qualification tests in determining the 45 flaw degrees of the vertical axis. '

Questions on BAW-2346P. April 1999

4. Pages 79-83, TEC Growth Assessment. (1) On page 80, it is stated that a positive number in Figures 9-3 and 9-4 represents apparent crack growth. Explain the negative growth values in those figures and causes for the negative growth values. (2) Clarify whether negative growth rates were used in calculating the mean growth rate and the basis for using negative values.

(3) Framatome calculated an average growth rate of 0.01 inches per EFPY for steam generator "A". However, the maximum growth rate in the growth data is 0.06 inch as shown in l Figure 9-3. Provide the basis for not using a bounding growth rate. (4) If the average growth rate is found to be positive, the licensee needs to assess the impact of the growth rate distribution on the attemate repair criteria methodology. Please provide appropriate reporting requirements in the proposed TS for such assessments l

l 5. On page 64, it is stated that probability of detection (POD) for plus point and for pancake coil were derived based on a 90% confidence for cracks greater than 50% through-wall.

Discuss the basis for using 90% confidence value for cracks greater than 50% through-wall.

ENCLOSURE

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e j 6. The leakage from TEC indications was calculated by the licensee based on applying a 95%/50% leak rate for each TEC indications and summing these leak rates to obtain the total steam generator leak rate. In addition, these leak rates have been adjusted to reflect a POD of 0.84 evaluated at a 90% confidence level. The licensee is requested to submit information assessing the conservatism of its estimate relative to a total steam generator leak rate (POD adjusted) which is conservative with a probability of 0.95 when evaluated at the 95%

confidence level.

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Mr. John Paul Cowan CRYSTAL RIVER UNIT NO. 3 Florida Power Corporation cc' Mr. R. Alexander Glenn Chairman Corporate Counsel (MAC-BT15A) Board of County Commissioners Florida Power Corporation Citrus County ' -

P.O. Box 14042 110 North Apopka Avenue St. Petersburg, Florida 33733-4042 invemess, Florida 34450-4245 Mr. Charles G. Pardee, Director Ms. Sherry L. Bemboft, Director Nuclear Plant Operations (PA4A) Nuclear Regulatory Affairs (NA2H) ',

Florida Power Corporation Florida Power Corporation -;  ;

Crystal River Energy Complex Crystal River Energy Complex t 15760 W. Power Line Stiet 15760 W. Power Line Street Crystal River, Florida 34428-6708 Crystal River, Florida 34428-6708  ;

Mr. Michael A. Schoppman Senior Resident inspector Framatome Technologies Inc. Crystal River Unit 3 1700 Rockville Pike, Suite 525 U.S. Nuclear Regulatory Commission +

Rockville, Maryland 20852 6745 N. Tallahassee Road Crystal River, Florida 34428 ,

Mr. William A. Passetti, Chief .

Department of Health Mr. Gregory H. Halnon Bureau of Radiation Control Director, Quality Programs (SA2C) j 2020 Capital Circle, SE, Bin #C21 Florida Power Corporation Tallahassee, Florida 32399-1741 Crystal River Energy Complex 15760 W. Power Line Street Attomey General Crystal River, Florida 34428-6708 Department of Legal Affairs The Capitol Tallahassee, Florida 32304 Mr. Joe Myers, Director Division of Emergency Preparedness Department of Community Affairs 2740 Centerview Drive Tallahassee, Florida 32399-2100 1