ML19206B019
| ML19206B019 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/17/1975 |
| From: | Haynes R, Varela A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19206B009 | List: |
| References | |
| 50-320-75-08, 50-320-75-8, NUDOCS 7904210718 | |
| Download: ML19206B019 (10) | |
See also: IR 05000320/1975008
Text
.
.
'
.
IE I Form 12
(.
. 7a) (Rev)
U. S. NUC1. EAR RF4UL\\ TORY CC:01ISS10N
OFFICE OF INSPECTION AND EN70 RCD 1E!TI
REGION I
Docket No:
en_,~
IE Inspection Report No:
50-320/75-Oc
_
Licensc ' o: roor ce
Licensec:
Metrocolitan Edison concany
Priorit .
-
Box 542
Reading, Pennsylvania 19603
Ca tegorf:
A
Safeguards
-
.
Group:
.
Middletown, Pennsylvania (Three Mile Island 2)
Location:
P n 871 We (B&W)
Tyne of Licensee:
Routine - Unannounced
.
Type of Inspection:
Dates of Inspection:
June 16. 17, 25 and 26, 1975
Dates of Previous Inspection:
June _10-13, 1975
/
2-
hkb
'
/ /7
75
'
Reporting Inspector:
A. A. V'arela, Reactor Inspector
,
_
Acco=panying Inspectors:
DATE
.
.
DATE
.
DATE
Oth r Acco=panying Personnel:
None
DATE
_
7//*!/W
Revieved By:
DATE
e
'
3
(
R. C. Haynes, Senior Reactor Inspector
.
.
,
.
~
79043297;g,W W
.
-
Gd
_
.
SIBS!ARY OF FI'iDISCS
Enfcrcement Action
A.
Ite=s of Meneccoliance
lione
L.
Deviations
1.
Grout Cube Ccerression Test Sannles
l
_
Contrary to the co=mit=ent in FSAR Section 3.8.1.6.5 and
Proj ect Specification 25550-30 to construction of the
reactor building in accordance with ACI Standard 301,
cube strength testing to ceasure the seven day co=pressive
strength of the grout used for the post tensioned tendens
was not perfor=ed. (Details, Paragraph 3.a)
2.
Chemical Recuirements of Freshly Mixed Grout
Contrary to the co dtment in FSAR Appendix 30, Section
3C.l.4 to construction of the post tensioned system in
accordance with the ASME B&PV Code,Section III, Division
2, tests to ceasure the chloride and nitrate concentrations
of the grout used for the post tensioned tendons was not
performed. (Details, Paragraph 3.b)
_
3.
'Alkalinir* of Freshly Mixed Grout
,
Contrary to an accepted industry code, ACI co~mittee 3t9,
" Criteria for Reinforced Concrete Nuclear Power Containment
Structuren," a special caterial requirenent and test to
measure the alkalinity of the wet grout nix used to fill the
post tensioned tendon ducts was not performed. (Details,
Paragraph 3.c)
Licensee Action on Previously Identified Enforcement Items
_
Not Applicable
(
1,
-
.
.
_2_
Desien Chances
None Identified
Unusual Occurrences
None Reported
Other Sienificant Findines
A.
Current Findines
1.
Acceptable Areas
a.
Observation nf Prestressine
Installation, tensioning and grouting of vertical
tendons was observed.
Except as identified in the
Enforcement Action and in Unresolved Items Sections
_
of this Su--ary of Findings, the work performed was
fcund to be acceptable.
(Details, Paragraph 6.a)
b.
Prestressing Record Review
Tensioning and grouting records of vertical tendons
were reviewed.
Except as identified in Enforcement
Action and Unresolved Items Sections, the records
were found to be acceptable.
(Details, Paragraph 6.b)
2.
' Unresolved Items
a.
Disposition of Prestressinc Nonconformances
The tendon prestressing subcentractor and the cen-
.
struction manager have iden-ified in formal reports
various items relating to technical nonconfor=ances
to procedures occurring during installation, stressing
an3 grouting of the vertical tendons. Engineering
evaluation, corrective action disposition and approval
by project engineering and the licensee has removed
sete nonconformances others are pending action by the
Deficiency Review Borrd.
This item is unresolved pending the inspector's
_
review of the licensee's disposition of these noncon-
for=ances.
(Details, Paragraph 4)
(
-
l
64-015
_
.
-3-
E.
Status of Previously Identified Unresolved Iter
(Reference Inspection Report 50-320/75-07, Details, Paragraph 11)
1.
De following item has been resolved:
Tendon grouting voids.
(Details, Paragraph 5)
a.
Manacement Interview
At the conclusion of the inspection, on June 26, a necting was held
by the inspector at the site vith the following personnel to discuss
the inspection findings.
Percons Prer g
General Public Utilities service Corporation
_
Mr. R. F . Fenti, Site QA Auditor
Mr. P. A. Levine, Site QA Auditor
Mr. S. Levin, Project Engineer
Mr. M. J. Sto= berg, Site Auditor
Mr. J. H. k'right , Resident Civil Engineer
United En2ineers and Constructors, Inc.
Mr. J. Carrabba, Field Construction /QC Supervisor
Mr. D. C. Lambert, Field QC Supervisor
Mr. F. Long. Assistant Field QC Supervisor
Mr. R. H. Mason, Job Engineer
Burns and Roe, Inc.
.
Mr. G. T. Harper , Jr. , Site Project Engineer
Stressteel Corcoration
~
rir. H. P. Papworth, QA Supervisor
The following items were discussed and the inspector's findings
were noted by the licensee.
_
m
-
'
G4'016
_
.
-4-
A.
Purpose of the insocetion
The inspector stated that this was an unannounced inspection
to observe the installation, stressing and grouting of the
vertical tendons; to review the contractor's QC syste=; and
to review actions taken on previcusly identified unresolved
itens related to prestressing.
B.
Deviations
The ite=s discussed are as delineated in paragraphs 3.1, 2 and
3 of the Enf orcement Action Eection of this report.
C.
Acceptable Area
The items discussed are as delineated in paragraph A.1 of the
Other Significant Findings Section of this report.
D.
_Resolutior of Previously Identified Unresolved Item
The item discussed is as shown in paragraph B.1 of the Oth..
Significant Findings Section of this report
E.
Unresolved Items
The ites discussed is
delineated in paragraph A.2 of the Other
Significant Findings Section of this report.
.
-
O
-
e
i
g
h
>
_
DETAI _LS
l.
Persons Contacted
General Public Utilities Service Corporation
Mr. R. F. Fenti, Site QA Auditor
Mr. L. Garibian, Mechanical Engineer-Senior (Hoce Office)
Mr. P. A. Levine, Site QA Auditor
Mr. M. J. Stromberg, Site Auditor
Mr. J. E. Wright, Resident Civil Engineer
_ United Encineers & Constructor's, Inc.
Mr. R. Brennan, QC Inspector
.
Mr. J. Carrabba, Field Construction /QC Supervisor
Mr. R. Delarm, Civil Superintendent
Mr. R. Engle, QC Inspector
Mr. D. Lachert, Field QC Supervisor
Mr. F. Long, Assistant Field QC Supervisor
Mr. R. Mason, Job Engineer
Mr. W. Tinlin , Construction Civil Supervisor
Mr. N. Reit:1, QC Inspector
'Eurns & Roe, Inc.
Mr. G. Harper, Jr. , Site Proj ect Engineer
Mr. O. Mallon, Supervising Civil Engineer
.
'Stressteel Corporation
-
Mr. G. Barr, QC Inspector
Mr. R. Bonomo, Field Engineer
Mr. M. Johnson, Construction Supervisor
Mr. R. Marshall, Laborer
Mr. H. Papworth, QA Supervisor
Mr. R. Rogers, Foreman
Mr. E. Schechter, Corporation President
Mr. M. Schupack, Grout Consultant
Mr. H. Strickland, QC Inspector
Mr. M. Suarez , Proj ect Manager
-
Mr. D. Thomasco, QC Inspector
.
l.
G4-018
~
.
m
.
-6-
2.
Construction Status
Post tensioning of the containment building is in progress.
Site work resuced after a five week work shutdown during
part of Fby and June ,1975 due to labor union contract
negotiaticns. As of June 25, seventeen vertical and two
horizontal tendens have been installed.
Thirteen vertical
and two hori:catal tendons have been ntressed and grouted.
3.
Deviations in Testine Production Grout for Post Tensioned Tende;_
a.
Grout Cube Concressier Test Saccles
The FSAR, Section 3.8.1.6.5 cc=mits construction of
the reactor building to ACl 301, Specifications for
Structural Concrete for Buildings.
Project Specifi-
cation 25550-30 for the reactor building tendons also
i= poses this standard.
Chapter 15 of this ACl standard
requires that the minimum 7-day compressive strength of
2-inch grout cubes tested in accordance with ASTM C109
to be 2500 psi.
No cc=pressive strength tests have
been perforced of the grout used to surround the
reactor building tendons to verify conformance to this
standard. At the management interview, the licensee
stated that grout strength is not a factor in the
design of the reactor building and referred to the
FSAR, Appendix 3A, So-ary of Airplane Impact Design.
Section 3A.4.2.1, states in part: " Contribution of
the locking effect provided by the hardened grout
surrounding the prestressing steel tendons has been
neglected in the analysis;
1.e.,
total loss of pre-
stress force has been assu=ed for each of the eight
disabled tendons."
-
The inspector observed that exception to this standard
requirement had not been specified in the PSAR and so
this item is considered to be a deviation from the
licensee's co=mitment to ACI 301.
_
(
f
I
l
gli-019
!
_
.
.
-7-
b.
Chenical Recuirements of Freshly !!ixed Grou
The FSAR, Appendix 3C, Section 3C.1.4 states that the post
tensioned syste= fully co= plies with ASMI B&PV Code Section
III, Division 2.
This code in Section CC-2243.3, Chemical
Requirements, states that the following grout constituents
shall be controlled such that the f ollowing li=its f er
freshly =ixed grout are not exceeded:
Chlorides as Cl , 300 pp= max.
Ultrates as NO
,
100 pp= =ax.
3
. No tests have been taken during the productica grouting of'
the reactor building tendons to verify conformance to this
code.
.
c.
Alkalinity of Freshly Mixed Grout
_
ACI Co==ittee 349, Title No. 69-2 publication, published in
January, 1972, establishes rules in the for= of a code for
the design, construction, and testing of all composite
concrete and steel ce=ponents associated with nuclear power
reactors such as reactor vessels and contain=ents.
Section
3.3.2.5.3 of this code states that grout which is used to
provide corrosion protection shall ccnfor= to Section 15.2.6
of ACI 301 and incorporate caterials complying with Section
3.2 of this docu= eat (Title No. 69-2), and the alkalinity of
the wet grout cix shall be greater than a pH of 11 and less
than a pH of 13.5.
No tests have been taken during the
productica Erouting to verify conformance to this code.
4.
Disposition of Prestressing Nontonfor=ances
-
The inspector reviewed the UE&C file of deviation reports and
nonconfor=ance reports of the post tensioning sub contractor.
in accordance with the licensee's quality assurance progra=,
identified nonconfor=ances have been reported in tendon installa-
tion, stress'ing and grouting.
Engineering evaluation, corrective
action and disposition has been obtained on some of these ite=s.
Others are pending action by the Deficiency Review Board composed
of licensee's engineering and QA site auditor, A/E, construction
canager and post tensioning engineer. The following list of
DR's were not closed out as of 6-25-75:
_
_
'
G4-020
.
.
.
.
-B-
UELC
Stressteel
Vertical
Subject
DR#
NCR f
Tenden Identi-
fication
0473
8
N 121
low grout level at tcp
N 123
of tendon
0475
9
F 310
sace above, grout viscositj,
N 310
te=perature agitation, and
grout refill tice
0477
10
F 217
wires broken in stressing
0478
11
N 312
stress sequence violated
N 127
0481
12
N 218
grout viscosity
-
0481
13
N 30S
grout quality at top
0481
14
F 219
N 218
same as #8
This is an unresolved ite= pending the inspector 's review of the
licensee's disposition of these noncenfor=ances.
5.
Tendon Groutine Voids
(Reference IE:1 Repcrt 50-3?0/75-07, Details, Paragraph 11)
Stressteel Corporation's control procedure permits the top of
vertical tendons to be refilled with grout approximately one
-
hour af ter co=pletion of grouting if the grout level at the
top of cap vent pipe is found to be lower than six (6) inches
above the top of the grout cap. Tae B&R specifications permit
regrouting of vertical tendons f res *.he top anchorage without
linitations on time.
Inspection of the grout level twenty four
(24) hours af ter grouting the vertical tendons has disclosed the
grout level to be below the top of grout cap.
The IE inspector
~
observed se=e tenden grout levels were about twelve (12) inches
low.
These had been identified in NCR's and DR's by site persennel
and second stage grou: *ng has been approved by the Deviation
Review Board. Exploratory work was undertaken toward developnent
-
of changes to Stressteel's grouting procedure to correct this
-
problem. The IE inspector observed exploratory work such as
codification of water / cement ratio , =ix time, single tendon
and double (parallel) grouting of tendons, slading of cement
and chilling of water, grouting during early morning hours and
_
G4-021
'
_.
_
.
.
..
.
-9-
installing larger diameter and higher stand pipe with r fill
above the top cap of vertical tendons.
e
the IE inspector was informed during a telephone conversati
In addition,
with the licensee on July 7, that
on
Stressteel grout procedure
fl2 was revised by an approved engineering field change to
permit second stage grouting.
This item is resolved.
6.
Accertable Areas in Post Tensionint Vertical Tendons
Observation of Prestressine
a.
Except as specifically noted elsewhere in this report,
installation,
the
tensioning and grouting cf those tendens
observed during this inspection vere f ound to conform to
centrol procedures and approved codifications for installa-
tion and modifications for exploratory work in groutin
inspections and record appeared adequate.
_
g.
b.
_Prestressine Record Review
Except
as specifica11: noted elsewhere in this report,
records for those tendons tensicned on 6/17/75 and those
the
tendons grouted on June 20 and 25, 1975
and were found acceptable.
were reviewed
-
.
_
m
e
f
l
_
.
G4-~C' 2
i
m