ML20213G555

Safety Evaluation Supporting Util 860903 Submittal Re Insp of Core Spray Sparger Sys in Current Cycle 11 Refueling Outage.Licensee Satisfied Requirements of License Condition 2.C.(7) for Current Cycle 11 Refueling Outage

ML20213G555
Person / Time
Site:	Oyster Creek
Issue date:	10/31/1986
From:	Office of Nuclear Reactor Regulation
To:
Shared Package
ML20213G547	List: ML20213G545 ML20213G555
References
NUDOCS 8611180198
Download: ML20213G555 (2)

Text

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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION l

RELATING TO CORE SPRAY SPARGER SYSTEM GPU NUCLEAR CORPORATION JERSEY CENTRAL POWER & LIGHT COMPANY OYSTER CREEK NUCLEAR GENERATING NUCLEAR PLANT DOCKET NO. 50-219

1.0 INTRODUCTION

The staff has reviewed the submittal dated September 3, 1986, from GPU Nuclear Corporation (the licensee) regarding the inspection of the Oyster Creek core spray sparger system in the current Cycle 11 Refueling (Cycle 11R) outage.

Attached to the submittal was the licensee's topical report No. 037, Oyster Creek Core Spray System Inspection Program, Revision 0. Additional infonnation pertaining to the inspection of the repair assemblies (clamps), resolution calibration of the camera and some clarification of the inspection results was obtained from the licensee in a telephone conference call held on September 19, 1986.

Pursuant to License Condition 2.C.(7) of Provisional Operatina License No.

DPR-16 for Oyster Creek, the licensee is required to perform inspections of both core spray sparger and repair assemblies at each refueling outage and to obtain restart authorization from NRC after the staff's review of the inspection results.

2.0 EVALUATION

$ The licensee reported that an augmented inspection program was performed on the core spray sparger system during the current 1986 Cycle 11R outage at Oyster Creek. Remote visual inspections were performed on all accessible areas of the core spray spargers and nozzles, annulus piping, supports and repair assemblies. The resolution of the camera was calibrated in accordance with IE Bulletin 80-13 prior to performing the visual inspections. Ultrasonic examination was performed on the accessible areas of core spray spargers.

The inspection techniques and procedures used in this inspection were similar to those used in 1983 inspections.

The results of this inspection did not identify any new crack-like indications.

The unrepaired indications reported in 1980 refueling outage were not observed during)this inspection outage . Repair as well brackets wereasinstalled in the previous 1983 inspection at 10 locations (Cycle of the core spray10R sparger system during the 1979 and 1980 refueling outages. Because of the obstruction from the repair assemblies, those cracks or crack-like indications -

located underneath the assemblies could not be inspected; however, there were no indications of the existing cracks beneath these assemblies progressing beyond the assemblies. All 10 repair assemblies were visually inspected. Each assembly includina the lockina devices for the bolts was found to be intact.

8611180198 861031 PDR ADOCK 05000219 PDR

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1 Based on our review of the above stated inspection results and detailed

' discussion of the inspection with the licensee, we find that the sub,iect inspections were performed in accordance with IE Bulletin 80-13 and met the requirements of License Condition 2.C.(7).

3.0 CONCLUSION

Based on the above, the staff concludes that the licensee has satisfied the requirements of License Condition 2.C.(7) for the current Cycle 11R outage.

The staff also concludes that Oyster Creek should be authorized to restart from the current refueling outage because the conditions of the spargers have not changed since the previous inspection in the previous Cycle 10R outage and are, therefore, acceptable for an additional cycle of operation.

' To improve the inspection of the core spray sparger system, the staff recommends the licensee consider incorporating the following items in its inspection plan for future refueling outages:

(1) If the licensee chooses to supplement the visual inspection with ultra-

sonic examination, the following two items should be considered in per-j formino the ultrasonic examination

l (1) The personnel performing the ultrasonic examination and evaluation

should be qualified at EPRI, NDE Center for interaranular stress corrosion cracking (IGSCC) detection and sizing, and uses only the j oualified procedures and eouipment for inspection.

1 (11) To facilitate continued monitoring of the flaws, all ultrasonic indications of IGSCC in origin, irrespective of the depth, should be recorded.

! (?) When the outage schedule allowed, the inspection should be supplemented by an air test to ensure there is no through wall cracks in the areas i not accessible for visual examination. -

1 (3) The use of video enhancement technique should be encouraged during visual examination to verify the indications not of IGSCC in origin, such as scratches and gouges.

4.0 REFERENCES

1. Letter from R. F. Wilson (GPUN) to J. A. Zwolinski (NRC), Core Spray Sparger Inspections, dated September 3, 1986.

2. Phone conference call between J. Donohew and W. Koo (NRC) and D. Jerko j (GPUN) dated September 19, 1986.

j Principal Contributor: W. Koo i

Dated

October 31, 1986.

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