IR 05000498/1985014

Insp Rept 50-498/85-14 on 850722-26.Major Areas Inspected: Audit of Engineering Assurance Program,Task 85-1 Re Control Room HVAC & Task 85-2 Concerning Component CWS

ML20134M853
Person / Time
Site:	South Texas
Issue date:	08/24/1985
From:	Imbro E, Milhoan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
Shared Package
ML20134M847	List: IR 05000498/1985014 ML20134M843
References
50-498-85-14, NUDOCS 8509040296
Download: ML20134M853 (9)

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U. S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTI0ft AND ENFORCEMENT Division of Quality Assurance, Vendor, and Technical Training Center Programs Quality Assurance Branch Report No.: 50-498/85-14 Docket No.: 50-498 Licensee: Houston Light & Power Company Facility Name: South Texas Project Unit 1 Inspection At: Stone and Webster Engineering Corporation, Boston, MA Inspection Conducted: July 22-26, 1985 Inspection Team tiembers:

Team Leader: E. V. Imbro, Senior Inspection Specialist, IE Mechanical Systems: T. DelGaizo, Consultant, WESTEC Services Mechanical Corponents: R. Parkhill, Inspection Specialist, IE S. Gula, Consultant, Harstead Engineering Electrical: C. Crane, Consultant, WESTEC Services Instrumentation and Controls: J. Kaucher, Consultant, WESTEC Services d'$W4-x $ h h DbDate 5/h'

Eugene V. Imbro' '

Team Leader, IE Approved by: ur % f/2f/l'f James L. M11hoan Date

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Sgetion Chief Quality Assurance Branch, IE I

B509040296 850828 DR ADOCK O 4y8

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SOUTH TEXAS PROJECT - UNIT 1 INSPECTION OF AUDIT RESULTS; TASXS 85-1 AND 85-2 JULY 22 THROUGH 26, 1985 4 . Background On March 1, 1984, representatives of Houston Lighting and Power Company (HL&P) presented to the NRC the details of the Engineering Assurance Program (EAP) being conducted'on the South Texas Project (STP). As a result of this. meeting and additional information provided by HL&P, the NRC determined that this program, if properly implemented, could provide

.the additional assurances of design adequacy normally provided by an .

Independent Design Verification Program (IDVP). Formal acceptance of ,

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the EAP as a substitute for an IDVP was provided via letter to HL&P dated August 20, 198 '

The NRC decided to monitor the STP Engineering Assurance Program in three phases for Task 85-1, Control Room HVAC and Task 85-2, Component Cooling Water System: (1) implementation of the program plan and ,

procedures, (2) review and evaluation of audit results, and (3) follow-up of corrective action. The first phase of inspection was accomplished at the headquarters of Stone and Webster Engineering Corporation (SWEC)

in Boston during the week of April 23, 1985. The report of this inspection (No. 50-498/85-09) was forwarded to HL&P on July 12, 19P5 (8. K. Grimes, NRC.to J. H. Goldberg, HL&P).

' Purpose The purpose of tF.% inspection was to review and evaluate audit results for Tasks 85-1 (Control Room HVAC System) and 85-2 (Component Cooling Water System). Specifically, the objectives of the inspection were:

(1) to verify that Tasks 85-1 and 85-2 were performed in sufficient technical depth to achieve objectives of the EA Program; (2) to verify that the background documentation supported the findings and conclusion '

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of the reports; and (3) to review the status of items identified by the

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NRC in Inspection Report 85-0 . NRC Inspection Items l Assignment Name, Position-Team Leader

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. Imbro, Senior Inspection Specialist, I Mechanical Systems T.' DelGaizo, Consultant, WESTEC Services  !

Mechanical Components R. Parkhill, Inspection Specialist, IE i

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S. Gula, Consultant, Harstead Engineering Electrical Power C. Crane, Consultant, WESTEC Services

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f Instrumentation and .J. Kaucher, Consultant, WESTEC Services  !

Controls

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'4. Personnel Contacted The following is a brief list of key personnel contacted during this inspection:

Name Organization Position R. Frazar HL&P EA Program Manager S. Basu HL&P EA Program Staff M. Chakravorty HL&P EA Program Staff P. Garfinkel SWEC VP & Sr. Eng. Manager A. Banerjee SWEC STP EA Proj. Manager J. Hendrie HL&P EA Oversight Comittee R. Laney HL&P EA Oversight Comittee H. Woodson HL&P EA Oversight Comittee 5. General Conclusions

! Based on this review, the NRC-found that Tasks 85-1 and 85-2 were

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acceptably completed subject to comments contained in this repor The SWEC review was comprehensive, checksheets were thoroughly completed, files were in good order, and backup documentation was auditable and supported SWECs findings and conclusions. Subsequent NRC inspection will focus on resolution of action items and implementation of corrective action Specific coments identified in Inspection Report 50-498/85-09 were reviewed by the NRC during this inspection. All items were closed out with exception of item I.2.b, which will be verified during the next inspection. Also, items I.4.d and II.2 were closed out based 4 upon comitments to include these items in future EAP Tasks. Details regarding disposition of all previous inspection items are given in Attachment 1 to this repor Specific Coments Specific comments on a technical discipline basis are included in Attachment 2 to this repor (

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ATTACHMENT 1 SOUTH TEXAS PROJECT DISPOSITION OF PREVIOUS INSPECTION ITEMS

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DISPOSITION OF PREVIOUS IMSPECTION ITEMS INSPECTION NO. 50-498/85-09 Item No. Status Reason Closed A detailed review of documentation for Task 85-2 indicated most documents were prepared in 1983 and earlier. With regard to Task 85-1, the decision to review Control Room HVAC was made in late November 1984 (as documented by a SWEC letter to HP&L dated 11/16/84 recommending the review) and most Task 85-1 design documents were dated prior to that time.

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-I. Closed The reference documents were obtained (through RFI-85-1-28) and were reviewed by SWE I. Open The referenced architectural drawing did not contain specific dimensional information for SWEC's revie This dimensional information will be verified during our forthcoming inspection in Housto I. Closed STP project engineering has.been requested to resolve this item by HP&L EA in Action Item No. 1 I. Closed There was sufficient evidence that these items and similar' calculational input and assumptions were being reviewed and evaluated by SWEC. With regard to the location of radiation detectors, the location is fixed by the calculation and drawings. Any change in this location will require a formal design chang I. Closed There was sufficient evidence of review of single failure considerations, including a finding associated ;

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with Task 85-1. This finding was forwarded to STP by finding No. 4 I. Closed SWEC identified justification of the assumption as a !

concern to be resolved in the electrical discipline review for EAP Task 85- I. Closed Data sheets in question were from the appropriate material requisition (

I. Closed See item I.2.d, abov I. Closed See item I.2.a, abov I. Closed HL&P has committed to have SWEC review the validity ;

of the assumption regarding loss of offsite power i during a future EAP Tas '

I. Closed See item I.2.c, abov i

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Item N Status Reason I Closed The acceptability of the BISEPS program for this application has been adequately documented by the SWEC revie I Closed HL&P has committed to review design change control at STP, for all disciplines, during a future EAP tas III. closed The Document Review Plans were found to be traceabl III. Closed Both of the NRC concerns have been included in the EAP Task 85- III. Closed HL&P has committed to have SWEC obtain and review set point calculations as soon as possobl III. Closed SWEC has identified this item for resolution by STP via DRP-85-1-6-M45, Item 3.2. Also, the deluge valve is a manual valve and has no control functio III. Closed HL&P EA has identified Action Items No. 9 and No. 55 to STP project engineering for resolutio III. Closed Several instrument loops were reviewed by SWEC as part of the CCW System Review (Task 85-2).

II Closed These items pertain to Task 85-3 (Medium Voltage AC)

which will be reviewed as part of a future inspectio These items have been closed based on SWEC commitments to include them in the 85-3 review.

j Note: The following items will be reviewed by the NRC in forthcoming inspections

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to ensure proper resolution by HL& ,

I. I. I. i I. I. I III. III. (

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ATTACHMENT 2 SOUTH TEXAS PROJECT SPECIFIC DISCIPLINE C0!9 TENTS

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1.0 MECHANICAL SYSTEMS Observation No.1.1, Documentation of SWEC's Verification of Design Input Information Item 3.1 of DRP-85-2-4-M19 asks, "Were the design inputs correctly specified? The answer was m . However, some inputs were not completely traced to their sources; examples: Ref. 3 (Spec. 7R209NS034-D), coolant

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heater drain tank and Ref. 9 (Spec. 2V211VS001-E), RC Fan Coolers. Spot checking of the significant input information, particularly when large amount of input is involved (as was done here) is an acceptable technique; however, the documentation should reflect what was actually done and not leave an impression of a 100% review. When all insut information is not verified by actual review of references, TiiTs s1ould be so annotated on the DR Observation No. 1.2 CCW Surge Tank Environmental Conditions Item 3.1 of,DRP-85-2-5-M26 identifies discrepancies between the specification and EEQ documentation relative to CCW surge tank environmental condition Item 3.1 further states, "STP should revise the specification to reflect correct post-accident conditiens". Since the CCW surge tank is both designed and installed, the implications of the above statement should be stated. Recommendation for corrective action in this instance should have included a statement relative to verifying that the design of the tank meets the revised post-accident environmental condition Observation No. 1.3, CCW Network Analysis

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The following problems were identifed in the CCW Network Analysis (Cal R209MC5858):

(a) The isometric piping diagrams were not used to verify code input (b) For node connecting elements that contain more than a single pipe size, it is not clear that the appropriate pipe ID was used to !

convert L/D's to equivalent pipe lengt (c) On sheets describing the node connecting elements, the nominal .

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pipe size is specified rather than the actual pipe I It is not clear, however, if the actual pressure drop cales were based on the internal ciameter'of piping. This was subsequently verified by SWEC; i.e., correct value was use C HL&P committed to have SWEC review a representative sample (5 or 6) of node connecting elements by comparing them with the isometrics.

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2.0 MECHANICAL COMPONENTS Observation No. 2.1, Design Change Evaluation The EA program has not evaluated the process by which Bechtel controls design changes in the pipe stress and pipe support areas. HL&P has comitted to include review of the design change process for all design disciplines in a L future EAP assessmen . . . . - - . - _ .

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3.0' ELECTRICAL /I&C

Observation 3.1, Internal Panel Wiring Separation Review plans 85-1 and 85-2 do not include a review of internal panel wiring separation, but rather the review of separation requirements stops at the connection to the individual panel. HL&P has comitted to including separation within panels in a future technical assessment.

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