ML20072U475

Core Spray Sys Insp Program

ML20072U475
Person / Time
Site:	Oyster Creek
Issue date:	04/13/1991
From:	Devine J, Manning W, Nademus R GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20072U469	List: ML20072U466 ML20072U475
References
TR-080, TR-80, NUDOCS 9104190158
Download: ML20072U475 (14)

Text

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4 Topical Report No. TR-080 Page 1 of 14 OYSTER CREEK CORE SPRAY SYSTEN INSPECTION PROORAM TOPICAL REPORT NO, TR-080 Project No. 328203 I Ar W V 9/

AUTHOR R. Nadamus, NDE/ISI Engineer / <6 ate APPROVALS:

kh0baALuMM 4'/8!11 W.P. Manning,NDhSIMgr Date 09/4&

D. W. Covill, dn r NdE/ISI V/9/9/

Date G _ L lA. ~

C. A. Nascari, Director QA 9/n /41

' Da'te g2 {

J. C. DeVine, Jr. Date Director Tech Functions (Significant Impact Review) 0352v 9104190158 910415 PDR ADOCK 06000219 o PDR

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'. Topical Report No. TR-060 Page 2 of 14 61111119T During the 1991 Refueling Outage (13R) at Oyster Creek, an augmented inspection program was implemented on the Core spray sparger system. In-Vessel annulus pipitag and sparger assemblies were inspected utilising remote visual examination. In addition, an air test was performed. No new relevant indications were identified.

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Topical Report No. TR-080 Page 3 of 14 I l

2AM&_9P CONTIFla EAllt Introduction 4 Visual Inspections 5  ;

core Spray Sparger Core Spray Annulus Piping Air Test 6 Conclusions 7 References 8 Attachas is Table 1 - Core Spray Piping Inspection Summary 9/10 rigure 1 - Core Spray Annulus Piping Asimuths 11 Figure 2 - General Layout - Core Spray Sparger. 12 rigure 3 - Upper Piping Unit 13 Figure 4 - Lower Piping Unit 14 f

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• - Topical Report No. TR-060 Page 4 of 14 plSIER CREEK CORE SPRAY SPAR 0ER SYSTE}J 1ESPECTION PROOB!LJ 1 RTE 9 DUCTION The augmented inspection program for the Core Spray Sparger System was performed during the present 1991 refueling outage. _The results of the inspection are reported herein as required by $fition 6.9.3.e. "Uningt Reportina Recuirements" of Oyster Creek's Technical Specification.

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l Topical Report No. TR-000 page 5 of 14 YlWh.Ilt\lill!ATl9Jia The Core Spray Spargers were visually inspected utilising a Westinghouse Model ETV-1250 video camera with twin 50 watt auxiliary underwater lighting. The video camera was mounted on a pole which was attached to a fixture mounted on the refueling bridge. The calibration standard utilised for the visual examinations, a one mil wire, was in accordance with the requirements of NRC I & E Dulletin 80-13.

The visual inspections of the spargers were performed as follows:

1. Downward view of the top of the upper spargers (spargers A & C)

2. Straight on view of the upper spargers

3. Straight on view with a alight down angle (due to guide blade interference) of the lower spargers (spargers D & D)

4. Straight on view of both upper and lower spargers with their associated nossles

5. Straight on view of the upper and lower nossles No relevant indications were noted during the inspections or subsequent review of video tapes.

Visual inspection of the Core Spray System Annulus Piping was performed utilising a Westinghouse Model ETV-1250 video camera with underwater auxiliary lighting. Due to access restrictions, a hand held camera technique was used to perform the examination. All accessible areas of the piping were inspected.

Refer to figures 1 through 4. No relevant indications were noted during the inspection or subsequent review of video tapes.

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Topical Report No. TR-000 page 6 of 14 AIR. TEST An air test was performed on Core Spray Sparger Systems I and II. Because of the configuration of the core spray piping, the upper spargers with downward pointing nossles should fill completely with air. The down leg between the reactor vessel penetration and the horisontal circumferential pipe run in the annulus should fill completely with air. All other piping will, at best, fill only partially with air or just pass air bubbles along its upper centerline inside surface.

Observation of the Core Spray Sparger System during the air test was performed by utilising a hand held Westinghouse Model ETV-1250 video camera with twin 50 watt auxiliary underwater lighting. Air bubbles were observed coming from the nozzles as expected. A steady stream of air bubbles were observed coming from the end (204') and middle (20B*) of the repair clamp located at azimuth 204' to 210'. No other air bubbles were observed coming from the other eight repair clamps, the spargers thummelves, or the annulus piping.

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i-I Topical Report No. TR-080 l Page 7 of 14 i f

CONCLUSIONE Following completion of all inspections relative to the Core Spray system, a review was conducted of the results along with the acceptance criteria of specification SP-1302-56-119, Rev. 1, the following conclusions are drawn from this review. ,

I The number of confirmed cracks in the sparger assemblies is one (1), that being the through-wall crack at 200* identified and clamped in 1970 and confirmed by a continuous supply of air bubbles during the air test. I i

' Visual inspection of the spargers showed various scuff marks, scrapes, undercut and discolorations on the sparger surface.

• All repair clamps appeared to be intact and in good condition.

No indication that could be interpreted as crack-like was noted during the examination or post examination review. )

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Topical Report No. TR-080 Page 8 of 14 l

i BIIIM!LCI.S (1) NRC I & E Bulletin 80-13, " Cracking in Core Spray spargers" (2) General Electric Nuclear Energy Procedure #0E-VT-200, Rev. O, FRR

1. 0CN1-1, "Invessel Visual Inspection (IVVI) Procedure for BWR 2 Reactor Pressure vessel Internals."

Specification SP-1302-56-119, Rev. 1, " Specification for Reactor Vessel (3)

Interns 1 Inspection 13R Outage."

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Topical Report No. TR-000 Page 9 of 14 -

TABLE 1 .

CORE SPRAY PIPING INSPECTION

SUMMARY

Spargers Annulus Pipinq Visual Ultrasonic visual Ultrasonic Air Test Remarks 1978 1 through --

No indications -

Air release One Repair Bracket wall crack observed from installed at 208*

1 crack (208*) (Sys II) only 1980 19 indications' 16 indications 2 indications -

Seven Repair called cracks Brackets installed (Sys II) two repair brackets installed (Sys I) 28 Total Indications (excluding 1978 indication) 1982 video enhanced --

Video enhanced -- - -

video 1980 visual in- on 1980 indication Enhance- dications. Results Results: Not a ments identified: crack (6 x 5 3 cracks reducer)

-2 possible cracks 1983 No indications * ' No indications

• No indications No indications

• Area of (4 of 1980 (5 of 16 - 1980 7 welds Inspection limited indications indications inspected by repair brackets examined) rechecked) 1986 No indications

• No indications

• No indications -- - -

1988 No indications * -

No indications -

Air release Air release observed from two from 196* repair repair brackets bracket upper sparger intermittent. Air release from 208*

repair bracket continuous.

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Topical Report No. TR-080 Page 10 of 14 TABLE 1- (Continued)

CORE SPRAY PIPING INSPECTION SUP9 TART Annulus Piping Spargers Ultrasonic Air Test Remarks Visual Ultrasonic visual

-- Air release Air release from 1991 No indications -- No indications observed from 208' repair bracket one repair contintrous .

bracket (208*)

upper sparger.

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i Topical Report No. TR-080 Page 11 of 14 e

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Topical Report No. TR-0B0 Page 14 of 14 2 w o' L.I w (* l 14 (o .. 2 s. V

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