IR 05000324/1989022
| ML20248C466 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 09/22/1989 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML20248C465 | List: |
| References | |
| 50-324-89-22, 50-325-89-22, NUDOCS 8910030474 | |
| Download: ML20248C466 (2) | |
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ENCLOSURE
downstream of the RHR heat exchange Because the temperature peaked at 215 F, the licensee prepared Engineering Evaluation Report 88-0365 and re-evaluated the pipe stress model for.the elevated temperature to determine piping operabilit Additional analysis was done to determine if the piping would have remained operable at 215 F during a- Design Basis Earth-quak Also, a re-analysis of the pipe supports associated-with the affected piping was completed to qualify them as operable during a Design Basis Earthquake coincident with an operating temperature of 215 The inspector reviewed Calculation No. 25W-261-02, Revision F-0, entitled, "Re-analysis of Pipe Supports on Service Water IS0's D-2846, Sheets 261, 262, 263, 266, and 267." This calculation includes 32 attachments which -contain . load summaries and other pertinent information as well as individual support evaluation However, the pipe stress re-analysis was not available for review and there was no way to verify the loads shown on the .
summary sheets. Therefore, the pipe stress calculations must be reviewed during a future routine inspection to evaluate this issue fully. This item remains cae Followup on Unresolved Items (UNRs)
(1) (0 pen) UNR 50-324/88-13-01: "As-Built Drawing Discrepancies for Torus External-Piping Systems" The inspector requested a- status report on this item from the cognizant licensee engineer and u s told that the referenced discrepancies would most probat,1y be resolved in the Phase II As-Built Piping System Walkdown Verification Propnm, rather than doing it as a separate " stand-alone" effort. This would allow the most efficient use of resources. However, it also means that this item will not be closed until the completion of the Walkdown Verification Program, scheduled to be finalized in 1992. Therefore, this item remains ope (2) (0 pen) UNR 50-325,324/88-36-01: " Suppression Pool Temperature Monitoring System Adequacy" The inspector held discussions with the cognizant licensee engineer concerning this issue because the information presented for review was insufficient to close the item. The inspector and the engineer agreed on what information is still needed and the engineer began an effort to procure i This item remains upe PDR ADOCK 05000324 G .. PNU ,
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(3) (0 pen) UNR 50-325, 324/88 _s-04: " Accuracy of As-Built Phase II Piping Walkdown Verification" i
The inspector monitored the progress of the Walkdown Verification Program. This effort is the result of modifying earlier programs and is designed to accurately reflect the as-installed configuration of the safety-related piping and ;
, support The Quality Control Supervisor informed the inspector j that the program is on schedule, with over 40% of the walkdowns
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complet Virtually all of the walkdowns outside the drywells !
have been completed and currently none are in progress. They ]
will resume with the upcoming Unit 2 outage in Septembe '
Therefore, this item remains ope j (4) (0 pen) UNR 50-325,324/89-07-02: " Service Water Lube Water l Operability" i
Upon arriving at the site, the inspector reviewed the referenced l piping and supports to become familiar with the actual physical ;
configuration. All ten of the Lube Water Piping Supports had been repaired by cutting away the corroded portions and replacing them with new material. This new material was then covered t,y a Belzone surface treatment to act as a corrosion barrier against future deterioratio The inspector was told that this is a temporary fix until Plant Modifications 83-220L and 82-221L are implemented. These modifications will convert the Service Water Pumps to " product-lube" pumps, i.e. internal self-lubrication by the fluid being pumped, water in this cas This conversion will allow the removal of all lube water piping, valves, cyclone separators, lube water pumps, and existing support structur Only twa small (less than 1" 4) lines, for the motor cooler supply line and its return, will remain to be supported. The new supports are to be " Christmas Tree" type, a vertical tube steel " trunk" with " branches" consisting of structural angles to support the line The tube steel is welded to base plates which are situated on 1" grout pad The grout pads are utilized to elevate the supports above the general floor level, reducing their exposure to the corrosive environmen The inspector reviewed Engineering Evaluation Report N , which detailed the test done to determined if a short run of Lube Water piping at the Service Water Pump bearing could withstand a deflection of plus or minus 1" for the duration of a Design Basis Earthquake (DBE) without failure,12 seconds based upon Section 3.7.1.2.1 of the Final Safety Analysis Report (FSAR). The preliminary analysis re;ults indicated that the l fundamental frequency of the system is about 4 Hz. Therefore, .
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the system could expect about 48 cycles during a DBE. The l l
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