IR 05000295/1979002
| ML19269D437 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 04/05/1979 |
| From: | Danielson D, Yin I NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML19269D436 | List: |
| References | |
| 50-295-79-02, 50-295-79-2, 50-304-79-02, 50-304-79-2, NUDOCS 7906040052 | |
| Download: ML19269D437 (6) | |
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U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT
REGION III
Report No. 50-295/79-02; 50-304/79-02 Docket No. 50-295; 50-304 License No. DPR-39; DPR-48 Licensee: Commonwealth Edison Company P. O. Box 767 Chicago, IL 60690 Facility Name: Zion Nuclear Power Station, Units 1 and 2 Inspection At: Zion Site, Zion, Illinois Inspection Conducted: March 6-7, and 27-28, 1979
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Inspector:
T. Yin
.ouur-Approved By:
D. H. Danielson, Chief
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Engineering Support Section 2 Inspection Summary Inspection on March 6-7, and 27-28,1979 (Report No. 50-295/79-02 and No. 50-304/79-02)
Areas Inspected:
Inspection of licensee surveillance program for safety related snubbers including:
(1) observation of steam generator snubbers, (2) condition of pipe snubber installation, (3) review of licensee records, and (4) mechanical snubber tests; review of previously identified unresolved items. The inspection involved a total of 22 inspector-hours onsite by one NRC inspector.
Results: No items of noncompliance or deviations were identified.
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DETAILS Persons Contacted Commonwealth Edison Company (CECO)
- N. E. Wandke, Superintendent
- L. G. Soth, Administrative Assistant
- J. Marianyi, Technical Staff Supervisor J. K. Joosten, Primary System Engineer, Technical Staff
- J.
N. Wennerholm, Engineer, Technical Staff USNRC - RIII
- J.
E. Kohler, Resident Inspector
- Denotes some of those attending the exit interview.
, Licensee Action on Previously Identified Items (Open) Unresolved Item (295/78-21-01):
Snubber fluid dye may not be compatible with fluid and seal materials and not all the fluid was procured as safety related material. The inspector reviewed the latest Purchase Order No. 727527, dated January 24, 1979, for the GE SF-1154 fluid and considered the quality control adequate. The licensee stated that the fluid previously pur-chased without certificate of conformance will be used in nonsafety related snubbers. A letter from ITT-Grinnell (ITT-G) to CECO dated February 28, 1979, stated that Calco-Blue dye used in ITT-G supplied snubber fluid is compatible with ethylene propylene (EP)
seal material.
The inspector stated that some of ITT-G snubbers contain seal materials other than EP and dyes other than Calco-Blue were observed in many ITT-G snubber reservoirs.
The licensee is presently evaluating the need to test the compatibility of seals, fluid and dyes at adverse conditions.
The dyes being considered include blue, red, and the mixture of blue and red.
(Closed) Unresolved Item (295/78-21-02):
Snubber leak locations not being identified during surveillance. The inspector re-viewed the CECO Procedure No. TSS 15.6.48 "Grinnell Snubber Surveil-lance", dated May 22, 1978, and considered it acceptable in that leak location identification is required and the significance of the problem and necessary repairs or fixes are required to be evaluated by qualified staff personnel.
(Closed) Unresolved Item (295/78-21-05):
Snubber installation records not available during previous inspections. During this visit, the Sargent and Lundy Engineers (S&L) as-built drawings-2-22Sr8 176
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for the CVC System 2" and smaller field erected piping were reviewed by the inpsector. Althought detailed snubber installation requirements were not apparent, the approximate locations and loading requirements were adequately described. The inspector had no further questions.
(Closed) Unresolved Item (295/ 78-21-06): Field run pipe snubber maximum span without consideration of wall thickness and contents.
A S&L letter to CECO dated February 7, 1979, stated that the subject specification requirements were based on assumptions that (1) the largest commercially available pipe schedule for each pipe size, and (2) the piping is full of water.
The inspector had no further questions.
(Closed) Unresolved Item (295/78-21-08): Training records for snubber inspection and maintenance personnel were not available.
During this visit, the inspector reviewed:
(1) records of a training session held on February 15, 1979, "Grinnell Snubber Surveillance",
conducted by the site staf f, and (2) records of a training session held on February 21, 1979, "ITT-G Hydraulic Restraint Maintenance and Testing", conducted by ITT"G representative.
The inspector had no further comments.
Functional or Program Areas Inspected 1.
Review of Snubber Inspection Records a.
Unit 1 - September, 1978 Refueling Outage The inspector reviewed the ITT-Grinnell (ITT-G) snubber inspection records and stated that the following snubbers should be observed closely because deficiencies or lou fluid levels were identified during the last plant outage:
BDRS - 1027 MSRS - 115 BDRS - 1067 RC
- 2953 BDRS - 1057 RCRS - 1009 BDRS - 1037 SIRS - 1027 CCRS - 1145 SIRS - 1309 CCRS - 1039 SIRS - 1251 CCRS - 1264 SIRS - 1037 VC10 - 15 - 2 VC17 - 55 b.
Unit 2 - March, 1978 Refueling Outage The inspector stated the following ITT-G snubbers needed further observation because of deficiencies or low fluid levels being identiffad:
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BDRS - 2038 SIRS - 2205 CCRS - 2041 SIRS - 2208 CCRS - 2135C SIRS - 2211 CCRS - 2107 SIRS - 2218 MS - 9137 SIRS - 2219A MS - 8917 SIRS - 2219 2RHRS - 1110 SIRS - 2220 2RHRS - 1112 SIRS - 2221 2RHRS - 1113 SIRS - 2222 2RHRS - 1127 SIRS - 2326A 2RRRS - 1130 SIRS - 2340 2RHRS - 1125 OMB Ser. 7652 Upon completion of his review, the inspector stated that he will review snubber deficiency trends during future routine inspections.
No items of noncompliance or deviations were identified.
2.
Missing ITT-G Snubbers a.
During his review of Unit 1, September, 1978, refueling outage snubber inspection records, the inspector noted the following snubbers were marked, "Does not exist":
ASRS - 1108 (exists in 1977 inspection)
RC-2955 (exists in 1977 inspection)
During his review of Unit 2, March, 1978, refueling outage snubber inspection records, the inspector noted snubber RCRS-2160 was marked, "Does not exist."
The inspector requested clarification on:
(1) whether or not the latest safety related snubber listings were forwarded to the plant by Sargent and Lundy (S&L) the A-E, (2) whether or not all required snubbers had been installed in accordance with design changes and/or specifications, (3) the lack of agreement between the Unit 1, 1978 inspection and 1977 inspection documents.
This is an unresolved item (295/79-02-01; 304/79-02-01)
No items of noncompliance or deviations were identified.
3.
Observation of Unit 2 ITT-G Snubber Installation The inspector reviewed approximately 30 ITT-G hydraulic snubbers with various capacities. The conditions in general were good with the following exceptions:
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a.
Snubber VC279 - S2 was welded to a leak chase structural channel which was not designed for receiving seismic loading.
b.
Snubber VC279 - S7, the fluid reservoir was mounted on the side of the cylinder.
The reservoir should be installed on top of the cylinder according to the snubber manufac-turer's installation instructions.
c.
On several small snubbers the lockup velocity and/or bleed rate adjustment screw seals were leaking.
The conditions described in items a and b above were also iden-tified in RIII Report 50-295/78-21, Paragraph 5.
The licensee committed to fix these adverse conditions prior to Unit 2 plant startup.
This is an unresolved item.
(304/79-02-02)
No items of noncompliance or deviations were identified.
4.
Observation of Unit 2 Bergen - Patterson (BP) Steam Generator Snubbers The inspector observed the eight (8) BP large bore snubbers installed on steam generators (SG's) B and D.
The surface condition of the snubbers, the connecting tubings, and the reservoirs was good.
The inspector observed the cold position settings (CPS's) for the four (4) SG snubbers to be 11/16", 15/16", 1 9/16", and 2 1/16" with the smallest gap measurement closest to SG-B.
Further, the piston rods for the two smaller CPS's were covered with dirt, while the piston rods for the two larger CPS's showed shinny surfaces (an identi-fication of possible reverse thermal movement direction).
After a review of the design installation drawings and previous plant inspection records the inspector requested the licensee review the differences noted above. The licensee committed to perform the following:
a.
Measure CPS's for all SG snubbers, b.
Measure hot position settings (HPS) for all SG snubbers.
c.
Provide S&L the above CPS's and HPS's for evaluation.
In addition, have S&L evaluate why the CPS's differ from the 1 1/2" design CPS shown on the drawings. Also evaluate the significance of all the thermal movements measured that were less than 2" (design).
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This is an unresolved item (304/79-02-03). The inspector requested that the licensee notify RIII if the HPS's show less than 1" movement or if the HPS's show a movement that is in reverse direction.
No items of noncompliance or deviations were identified.
5.
Testing of Mechanical Snubbers Two mechanical snubbers M 2RC 147 - SR1 and M 2RC 146 - FR1 in the pressurizer area were tested for freedom of movement at low traveling speed and for lock-ups at sudden quick motions. No problem areas were identified during the tests.
Unresolved Items Unresolved items are matters about which more information is required in order to ascertain whether they are acceptable items, items of noncompliance or deviations.
For Unit 1, the unresolved item disclosed during this inspection is discussed in Paragraph 2.
For Unit 2, the unresolved items are discussed in Paragraphs 2, 3, and 4.
Exit Interview The inspector met with licensee representr.tives at the conclusion of the inspection on March 28, 1979.
The inspector summarized the scope and findings of the inspection. The licensee acknowledged the findings reported herein.
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