ML20009B649
| ML20009B649 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 06/05/1981 |
| From: | Kane J NRC |
| To: | |
| Shared Package | |
| ML20009B645 | List: |
| References | |
| NUDOCS 8107160549 | |
| Download: ML20009B649 (3) | |
Text
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RECORD OF TELEPH0ftE CONVEF.51,TI0 tis Dates: June 3 & 5, 1981 Project: Midland Recorded By: Joseph 0. Kane Talked With: On June 3, 1981 CPCo Bechtel NRC N. Leech A. Boos R. Landsman R. Ramun7am B. Paris J. Kane C. Russell On June 5, 1981 CPCo Bechtel NRC COE N. Leech N. Swanberg R. Landsman H. Singh R. Ramunsam C. Russell J. Kane B. Paris R. Abler Route To: For,Information G. Lear u ller a
CD. HocQ W. Paton R. Gonzales J. Kane H. Singh, COE R. Landsman, I&E, Region III Main Subject of Call: PERMANENT PLANT DEWATERING (REFER TO J. W. COOK's LETTER OF MAY 28, 1981 TO H. DENTON)
Items Discussed:
1.
Consumers r.evised Specification C-88 (Revision 8) and Bechtel's Quality
' Control Program on Area Dewatering System which were enclosures to J. W. Cook's May 28, 1981 letter. The following items were discussed:
a.
Consumer's request for NRC concurrence to proceed with installation of the backup interceptor wells is limited to wells designated B-1 through B-20 as shown on Figure 47-11 in " Responses to NRC Requests Regarding Plant Fill."
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2 b.
The borings Ond continuous SPT sampling in the depth interval where
- the filter pat.k is to be placed (borings located at every fourth well) were completed June 2, 1981. Gradation tests on recovered samples are now to be completed and the results made available to NRC to demonstrate that foundation soils are acceptably protected by the specified gradation.
c.
Page12, Par.10.0.4.b)2.
To assure that representative discharge water samples are taken for measurement of soil particles, Consumers j
will require their dewatering Subcontractor to locate the overflow line at a location that pemits representative water samples to be collected. I&E to check the overflow line location when it is installed.
d.
Pages 12 and 13, Par.10.0.4)b)2. Bechtel defined the " accumulative quantity of soil particles" to be equal to:
Amount of flow Recently measured Amount of flow Average soil (in gallons) soil-particles (ppm)
(in gallons) particle x
x cumped since pumped previously measurement (ppm) last reading Total amount of flow (in gallons) pumped since start-up NRC indicated this accumulative averaging method could obscure the need for corrective action should loss of soil fines begin to significantly develop in any one well. NRC also expressed concern that the specification required only " alerting" of the Subcontractor when the accumulative quantity exceeded 10 ppm and did not define what actions would be taken. NRC also requested that a time interval be included in the specification for removal or repair once an individual well had been identified as being unacceptable. A revision to Specification C-88 will be provided by Consumers and will indicate the following. The " accumulate quantity" approach will be dropped.
In its place Consumers indicated that the Monday and Thursday tests on the total dewatering system will require a limit of 10 ppm on soil particles.
If any test result indicates 10 ppm has been exceeded, there would be an imediate retest. If the retest confinns that the soil particles are exceeding 10 ppm, there would be an imediate systematic testing of each individual well. Any individual well found to produce greater than 10 ppm would be repaired or removed from the system within 24' hours of the initial test.
e.
Page13. Par.10.0.4)c). The sentence requiring repair or removal within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> will be added to this paragraph.
f.
Page 13, Par.10.0.4)d). The existing Par. d will new become Par. e and the previous requirements on purging the tank will be restored and will constitute Par. d.
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? g.
Page14, Par.10.E.1)d). The gravel pack to be used in the installation of wells will be packed and delivered in bags, consequently, particle size segregation should not be a problem. The spec will be revised to require the gravel pack to be washed and contain no clay or calcareous particles.
In addition to submitting gradation verification from the manufacturer, Consumers will run at least two gradation tests (one at delivery time and once during installation of the tenth well).
The estimated quantity of required gravel pack is 25 cubic yards.
Appropriate revisions to the Quality Control Inspection (OCI) and Project Inspection Plan and Report programs are to be made for these changes.
' h.
Th'e specification will either bc revised or expanded to address the concerns raised by I&E concerning acceptable quality of well screens and casing, approved type of pipe connections and grout mix.
1.
The QCI program vill have an addition that requires an accurate record to be kept on the 2 mount of gravel pack actually placed and consolidated in each well instali tion.
2.
NRC requested that a revised Specification C-88 and a revised Q/A program which i~ irporated the discussions and recommendations of the June 3 and 5 calls be.ubmitted to ISE, COE and NRR.
It was indicated by both the Staff and Consumers that all issues appeared'to be resolved and that the Staff would be in a position to concur with Consumers proceeding with the well installations upon receipt and favorable review of the revised Specification and Q/A program.
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