View source for 3F0399-04, Special Rept 99-01:on 990310,discovered Containment Tendons That Required Grease Addition in Excess of Prescribed Limits During Recent Insp Activites.Six Tendons Were Refilled with Appropriate Amount of Grease

{{Adams
| number = ML20207M064
| issue date = 03/10/1999
| title = Special Rept 99-01:on 990310,discovered Containment Tendons That Required Grease Addition in Excess of Prescribed Limits During Recent Insp Activites.Six Tendons Were Refilled with Appropriate Amount of Grease
| author name = Roderick D
| author affiliation = FLORIDA POWER CORP.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
| docket = 05000302
| license number = 
| contact person = 
| document report number = 3F0399-04, 3F399-4, NUDOCS 9903180371
| document type = REPORTABLE OCCURRENCE REPORT (SEE ALSO AO LER), TEXT-SAFETY REPORT
| page count = 2
}}

=Text=
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March 10,1999 3F0399-04 U.S. Nuclear Regulatory Commission Atta: Document Control Desk Washington, DC 20555-0001

==Subject:==
Special Report 99-01 Containment Tendon Grease Addition Exceeds Limit

==Reference:==
FPC to NRC letter,3F0498-04, dated April 16,1998, " Sixth Containment Tendon Surveillance Summary"

==Dear Sir:==
1 1
Please find enclosed Special Report 99-01, which discusses containment tendons that required the addition of grease in excess of prescribed limits during recent inspection activities. Based                      I on tendon corrosion problems previously identified at the Calvert Cliffs Nuclear Power Plant,
,         Florida Power Corporation (FPC) management decided to perform a review of the Crystal                                 1 j         River Unit 3 (CR-3) containment building vertical tendons to ensure that they contained an adequate amount of grease. During the refilling of some vertical tendons, six (6) tendons required the addition of grease in excess of 5 percent of the net duct volume of the tendon.
Exceeding this value requires submission of a special report within 30 days in accordance with Improved Technical Specification (ITS) 5.7.2.b and Regulatory Guide 1.35, Revision 3. A l         similar condition was described in the above referenced summary and evaluated to be acceptable.
No new commitments are being made in this submittal. If you have any questions concerning this special report, please contact Mr. Larry McDougal, Manager, Nuclear Regulatory j Compliance, at (352) 563-4988.                                                                                   I Sincerely, l
or 1   '
                             /                                                                                          ,&
                                                                                                                      'W Daniel L. Roderick, Director Nuclear Engineering & Projects DLR/'af 3
9903180371 990310~
PDR    ADOCK 05000302 Enclosure        s                    pDa xc:     Regional Administrator, Region 11 Senior Resident inspector NRR Project Manager CRYSTAL RIVER ENERGY COMPLEX: 15760 W. Power Line Street
* Crystal River, Florida 34428-6708 * (352) 795-6486 A Florida Progress Company

i
     *i U.S. Nuclear Regulatory Commission                                                          Enclosure 3F0399-04                                                                                 Page1of1 i
SPECIAL REPORT 99-01 CONTAINMENT TENDON GREASE ADDITION EXCEEDS LIMIT This special report is being submitted in accordance with the reporting requirements of Florida Power Corporation's (FPC) Crystal River Unit 3 (CR-3) Improved Technical Specification (ITS) 5.7.2.b and Regulatory Guide 1.35, Revision 3. This special report discusses containment tendons that required grease addition in excess of prescribed limits during recent inspection activities.
DESCRIPTION Based on the tendon corrosion problems previously identified at the Calvert Cliffs Nuclear Power Plant, FPC management decided to perform a review of the CR-3 containment building vertical tendons to ensure that they contained an adequate amount of grease. The function of the grease is to inhibit corrosion of both the tendon wires and anchorage components by displacing moisture.        ;
During the refilling of some vertical tendons, six (6) tendons required the addition of grease in     i excess of 5 percent of the net duct volume of the tendon. Exceeding this value requires submission of a special report in accordance with ITS 5.7.2.b and Regulatory Guide 1.35, Revision 3.
                                                                                                                ]
One hundred forty-four (144) vertical tendons were checked for the need to add grease. Six tendons required grease additions of more than 5 percent of total net duct volume. The following      )
table lists the amount of grease added and percent of net duct volume for each of the six tendons:
i TENDON                    GREASE ADDED                     % NET DUCT                 l NUMBER                       (GALLONS)                       VOLUME 16V5                             14.1                          9.8 23V5                             10.6                          7.4                   j 23V9                              7.5                          5.2 43V15                             7.9                          5.5                   ,
43V16                             7.5                          5.2                   l 43V19                             7.5                          5.2 EVALUATION A similar condition was evaluated after the last scheduled tendon surveillance (FPC to NRC letter, 3F0398-21, dated March 10,1998, "Special Report 98-01, Containment Tendon Does Not Meet Acceptance Criteria"). The evaluation concluded the corrosion protection system is functioning as designed. The cause was suspected to be grease settlement and voids created during grease installation. The previous evaluation, reported in the Sixth Contaimnent Tendon Surveillance Summary, is still valid (FPC to NRC letter, 3F0498-04, dated April 16, 1998).
: f.        CORRECTIVE ACTIONS i
The six tendons were refilled with the appropriate amount of grease. Visual observations were i         performed following the re-injection of the grease and no signs of grease leakage were noted. No additional corrective actions are necessary.}}